Abstract: An antenna assembly comprises an elongate radiating antenna (11) movable between a retracted position and an extended position. A pair of concentric conductors (9,10) provide coaxial feed to the antenna (11). In the retracted position the antenna 11 in conjunction with the coaxial feed (9,10) constitute a quarter wavelength transmission line which is short-circuited by a conductive flange (15) on the antenna. A short-circuited quarter wavelength transmission line electrically appears as an open circuit at the feed point. The antenna is thus automatically decoupled when it is moved to the retracted position without the need for additional switching or screening elements.

Abstract: A radio antenna has an antenna element 12 which is slidable with respect to a casing of the radio between an extended position (FIG. 5) and a retracted position. In the extended position, a metal plate 15 on the lower end of the antenna element 12 cooperates with a fixed dielectric 17 and a fixed metal plate 17 to form a capacitor providing a signal link to a coaxial cable 18 leading to a matching network. This avoids the need for a sliding metal connection, as in the prior art. In the retracted position of the antenna element 12, the capacitive link is effectively disconnected.

Abstract: A deployable and retractable, telescoping style mast assembly and method employs a plurality of tubular sections of differing diameters. The tubular sections are nested one-in-another and are slidable with respect to each other, in a telescoping manner, to provide a deployable/retractable telescoping mast assembly. Retractable pins are provided to retractably extend from a collar coupled to at least one of the tube sections. In their extended state, the retractable pins are adapted to extend through apertures provided in an adjacent tube section. The retractable pins are provided with a head at one end thereof. The head of each pin is adapted to be engaged by a guide coupled to a third tube section upon the third tube section being in a collapsed state. Upon engagement with the pin head, the guide operates to pull the pin into a retracted state so as to retract the pin out of the pin receiving aperture.

Abstract: A retractable antenna assembly with connector (200) allows communication devices that require the use of more than one type of antenna element (114), to easily store the normally used antenna element (114) inside of a housing (134) which is part of the antenna assembly (200). Once inside the housing (134), the antenna element (114) forms a half wave cavity that has a high impedance at the operating frequency of the communication device (302), thereby operatively decoupling the antenna element (114) from the radio frequency path. Once inside of housing (134), antenna element (114) forms part of a coaxial connector (112) with the top portion (116) of antenna element (114) forming the center conductor of the coaxial connector (112). Thereby allowing for an external antenna element (308) to be attached to the communication device (302).

Abstract: An antenna assembly comprises an elongate radiating element (11) movable between a retracted position and an extended position, and a substantially planar radiating element (12) extending transversely to the elongate element. The elongate element extends through an aperture (25) in the planar element. A pair of concentric conductors (9,10) provide coaxial feed to the radiating elements and the elongate element is slidably mounted within the inner conductor (9). In the retracted position the elongate element forms part of the coaxial feed to the planar element and is itself rendered inoperative as a radiator. The invention provides a compact and convenient dual antenna arrangement ideally suited for use in a portable cellular radio telephone.

Abstract: A vehicular multi-band antenna is adapted to receive signals in the AM/FM bands and to receive and transmit signals in a significantly higher frequency band such as that used for cellular telephone. The antenna is provided with a base section fixedly mounted on the vehicle and a removable antenna mast section removably received in the base section.

Abstract: An telescoping antenna includes a lower antenna portion and an upper antenna portion to be telescoped into the lower antenna portion. The lower antenna portion includes a cylindrical conductor having an inner cavity for accommodating the upper antenna portion and a coaxial feeder cable. A cylindrical member, which is electrically connected to the cylindrical conductor and the coaxial feeder cable, is provided in the cavity so that a first leakage current is prevented from flowing into the coaxial feeder cable from the cylindrical conductor and that a second leakage current is prevented from flowing into the lower antenna portion from the upper antenna portion.

Abstract: An arrangement for increasing the level of radiated and received energy in a telescoping antenna while the antenna is in a collapsed position. The increase in energy is obtained through use of a sliding member which projects from the base of the antenna and contacts antenna matching circuitry for making changes to this circuitry when the antenna is collapsed. Initially tuned for resonating signals for transmission and reception with the antenna in an extended position, the antenna matching circuitry is retuned by a switching action provided by the sliding member for more effective resonating of these signals with the shorter length antenna. The switching action of the sliding member also activates gain control circuitry which increases the signal levels in both an associated transmitter and receiver when the antenna is in the collapsed position.

Abstract: A driving apparatus for telescopic antenna, including an electric motor, a driving clutch member connected to the motor to be rotated by the motor, a driven clutch member opposite to the driving clutch member to define a viscous fluid containing space in association with the driving clutch member and connected to a telescopic antenna to extend and contract the telescopic antenna, and a viscous fluid contained in the viscous fluid containing space.

Abstract: A retractable motorized multi-band antenna is adapted to receive signals in the AM/FM bands and to receive and transmit signals in a significantly higher frequency band such as that used for cellular telephone. In order to transfer the coaxial input signal to an output coaxial connector, a slip ring connector is provided. The slip ring connector is impedance matched to the antenna to create low VSWR at RF frequencies.

Abstract: The first structural aspect for mounting a telescopic antenna for an automobile includes a nut surrounding the top end portion of a spacer pipe and engaging with a threaded portion cut on the outside of the top end portion of a base pipe; a flange and a collar provided on a conducting pipe and the spacer pipe respectively and clamped between a contact portion provided on the nut and the top rim of the base pipe; and a flat ring positioned between the flange and the collar. The second structural aspect for mounting a telescopic antenna for an automobile includes resilient protrusions defined on the spacer pipe; holes defined on the conducting pipe, for engaging with the resilient protrusions when the spacer pipe is inserted in the conducting pipe so that the spacer pipe can be kept in position; and a portion around the resilient protrusions having an inside diameter greater than that of the spacer pipe. Both aspects help secure easy sliding of the antenna rods.

Abstract: A rod antenna mounting mechanism that allows easy and reliable connection of a rod antenna with a radio circuit arranged inside and easy replacement of itself. The rod antenna is installed by fixing a rod holder slidably attached to the rod antenna such that it can be pulled out, and stowed in, the casing. With the rod antenna mounted to the casing, an elastically deformable feeder plate connected to the radio circuit is pressed into contact with a conductive pipe-like portion of the rod holder, thus enabling electrical connection of the antenna element with the feeder plate.

Abstract: A rod antenna includes extensible elements electrically connected to a high frequency power supply member. A low pass filter has one terminal connected to the extensible elements and the other terminal connected to a low frequency power supply member.

Abstract: An auto-extending antenna for a portable radio having a housing which can be closed is inserted into an aperture within the housing. As the housing of a radio using the auto-extending antenna is opened, a toothed wheel attached to the opening portion of the housing is rotated. This toothed wheel is coupled to a second toothed wheel and causes the second toothed wheel to rotate. The second toothed wheel is connected to a first hollow tube which has two opposing slots extending along almost the entire length of the tube. An antenna is inserted into the hollow portion of the first tube, and two opposing nobs attached to the bottom of the antenna protrude through the opposing slots. A second hollow tube fits over the first hollow tube. The inner walls of the second hollow tube have two opposing screw paths winding up its entire length. The nobs extend into the screw paths. The second tube is secured to the housing of the radio.

Abstract: An antenna device is comprised of a base member fixed to an automobile body, a first mast member, a second mast member and a third mast member. The third mast member is supported by the base member, the second mast member is supported by the third mast member and includes a plurality of telescopic elements and the first mast member is supported by one end of the second mast member and located away from the automobile body. A feeder conductor is connected to the first mast member through an impedance matching coil with the feeder conductor and the coil being molded in a resin elevation member. The resin elevation member extends through the second and third mast members and has an enlarged portion which surrounds the coil. The enlarged portion of the resin elevation member is in engagement with the second mast member and elevates the second mast member upon movement away from the automobile body.

Abstract: An arrangement for increasing the level of radiated and received energy in a telescoping antenna while the antenna is in a collapsed position. The increase in energy is obtained through use of a sliding member which projects from the base of the the antenna and contacts antenna matching circuitry for making changes to this circuitry when the antenna is collapsed. Initially tuned for resonating signals for transmission and reception with the antenna in an extended position, the antenna matching circuitry is retuned by a switching action provided by the sliding member for more effective resonating of these signals with the shorter length antenna. The switching action of the sliding member also activates gain control circuitry which increases the signal levels in both an associated transmitter and receiver when the antenna is in the collapsed position.

Abstract: A telescoping antenna structure suitable for use in a portable transceiver for increasing the level of radiated or received r-f energy while in a collapsed position and also obtaining the maximum permitted level of radiated r-f energy while in an extended position. The increase in r-f energy in the antenna while in the collapsed position is obtained through use of a projectable sliding member affixed to the antenna which comes in contact with and makes electrical changes to antenna tuning circuitry when the antenna is adjusted from the extended position to the collapsed position.

Abstract: A three-wave shared antenna used in an automobile comprises an MT wave element 10A wherein first and second phasing coils 11 and 12 are formed in an intermediate position of a conductive mast thereby forming the MT wave element 10A is formed in a three-step collinear manner to be able to transmit/receive an MT wave, a trap element 10B for interrupting the MT wave formed on top portion of the MT wave element 10A, and an auxiliary element 10C for AM and FM waves, which comprises another conductive mast connected to said conductive mast through the trap element 10B to be able to receive AM wave, which is a broadcast wave of an amplitude modulation system and FM wave, which is a broadcast wave of a frequency modulation system, in cooperation with said MT wave element.

Abstract: A lightweight extended aluminum or similar telescopic equilateral triangular tubular mast or tower assembly with coaxially disposed inner triangular sections and cable elevating and lowering drive apparatus for controlling low-resistance telescopic movement with alternate outside-to-inside canted pulley wheels mounted near the top of each section passing the cable downwardly and inwardly of the section to a flat pulley wheel mounted near the bottom of the next inner section.

Abstract: An extendable antenna device which is reducible in length when accommodated and ensures enough elasticity at an area of junction to a housing of a radio device. A first elongated flexible antenna section is connected slidably with a second antenna section. A hold mechanism is provided which holds the first antenna section against the housing of the radio device, and which accommodates and holds the first and second antenna sections in the housing of the radio device.

Abstract: A clutch for telescopic antenna including a disk shape clutch element and a shallow, cylindrical clutch element facing each other. The cylindrical clutch element is provide with a recess on its inner wall, and the disk shape clutch element is provided with a pair of sliding contacts which are urged in the radial directions and can come into contact with the inner wall surface of the cylindrical clutch element. An engagement ball provided in one of the sliding contacts can engage with the recess of the second element, securing the coupling of the two clutch elements.

Abstract: A telescoping antenna structure suitable for use in a portable transceiver for increasing the level of radiated or received r-f energy while in a collapsed position and also obtaining the maximum permitted level of radiated r-f energy while in an extended position. The increase in r-f energy in the antenna while in the collapsed position is obtained through use of a projectable sliding member affixed to the antenna which comes in contact with and makes electrical changes to antenna tuning circuitry when the antenna is adjusted from the extended position to the collapsed position.

Abstract: A telescopic antenna for use in vehicles including an antenna element which has a cap on its tip and a removable locking element at its base, an antenna housing which is mounted to the vehicle body and has an insertion hole for removably housing the antenna element therein, and a fastener provided on the antenna element and screwed in to the antenna housing for fastening the antenna element thereto. When the fastener is unscrewed and the antenna element is removed from the antenna housing, the fastener can be removed from the antenna element after the locking projection is dismounted from the antenna element regardless of the size of the cap so that the fastener is reusable.

Abstract: A multi-frequency antenna to be used commonly for reception of multiple different frequencies includes first and second rods extendably held by and through a third rod. The first rod is coupled to the second rod via a phase shifter so that when the first and second rods are fully extended, the antenna behaves as a high gain antenna for common use in an AM, FM and car telephone system.

Abstract: A multiband antenna system for use in a motor vehicle comprising an antenna unit responsible for first and second frequency bands. The antenna unit is electrically coupled to a first conduit tube which is in turn coupled coaxially to a second conduit tube with a capacitor being interposed therebetween. The capacitor is arranged so as to act as a short with respect to the first frequency signal and act as an open for the second frequency signal. The first conduit tube is connected to a first feeding terminal for deriving the second frequency signal and the second conduit tube is coupled to a second feeding terminal to derive the first frequency signal. This antenna system is constructed by using only one antenna unit having a predetermined length, thereby allowing simplification of the arrangement of the antenna system for easy manufacturing.

Abstract: A multiband antenna system for use in a motor vehicle, which includes a one-unit antenna section coupled to a transceiver for transmission and reception of a signal with a frequency in a first frequency band and a receiver for reception of a signal with a frequency in a second frequency band. The antenna section, being provided so as to be protruded upwardly from the motor vehicle, comprises a first antenna element adapted to operate with respect to the first frequency band and a second antenna element adapted to operate with respect to the second frequency band different from the first frequency band. The second antenna element is made up of a conductor tube which is in turn introduced into the motor vehicle and further extends up to the transceiver. A center conductor line is coaxially encased in the conductor tube so as to make up a coaxial line, one end of which is connected to the first antenna element and the other end of which is coupled to the transceiver.

Abstract: A rod antenna including a plurality of rods of respectively different diameters which are coupled with each other in a manner to be slidable. Each of the larger diameter rods is provided with a rectangular strip of film made of resin such that it is mounted in a ring shape at least at the inside joint area for coupling the larger diameter rod with the smaller diameter rod. The rod antenna can be low in cost since the cutting process done for the conventional antennas is eliminated, and the rectangular film strip is inexpensive and can be easily mounted. Besides, a satisfactory waterproofing can be obtained as the rectangular strip of film is excellent in heat resistance, cold resistance, water repellency, wear resistance, etc. Furthermore, the operating noise of rods during the extension or retraction of the antenna is low and the appearance of the rod can be kept clean.

Abstract: An automobile antenna control device generating a reset pulse which starts the operation of a microcomputer. The pulse is generated when an automobile radio power source is switched from "off" to "on," or when the power source is switched from "on" to "off," so that a so-called runaway of the microcomputer can be prevented. The power source is connected to an input port of the microcomputer; the antenna is extended when the power source is "on," and is retracted when the power source is "off." The extending or retracting action of the antenna is stopped when the starter power source of the master key switch of the automobile is "on.

Abstract: Manually extendable telescoping antenna for a vehicle or vessel having a continuous core provided in the interior of the antenna to reduce mechanical/wind generated vibration noises. With the antenna extended, the core loosely touches the insides of the hollow telescoping elements and thus dampens and prevents creating a propagation of eigen-vibrations into the vehicle or vessel interior. The preferred core configuration may be a plastic band, plastic coated wire, or hollow or foam-filled plastic tube formed in a helical spiral secured at its lower end to a guide tube and at its upper end to the solid rod upper antenna section.

Abstract: A telescopic mast is provided in kit form with stays wound on reels in a predetermined order. This order is such that when erecting the mast it is only necessary to walk between the mast and pegs fixed into the ground and not between two pegs at a distance from the mast. This minimizes the amount of walking which is necessary in erecting the mast. Clamps between sections are formed from a strap around the outer of two concentric sections. The ends of the strap are secured together and attached to a member with a pressure face. A camming device between this member and the mast which acts against the pressure face and the mast enables the strap to be tightened thus gripping the outer mast portion against the inner mast portion. The top section of a telescopic mast is less inherent rigidity than the bottom section and this it is preferable to construct it from material with a greater resistance to longitudinal bending than the lower section and to vary the resistance of the intermediate sections accordingly.

Abstract: An antenna for portable radiotelephones including an antenna element and antenna holder. The antenna element is covered by a non-conductive cover except for the tip and base ends which respectively have a cap and a sleeve, both made of conductive materials thereon. The antenna holder is made of conductive materials, fixed in a case of the telephone and is connected to a matching device. The antenna holder includes a fastening section and an engaging section and holds therein the antenna element so the antenna element can be pulled outside of and pushed back into the case. The fastening section engages with the cap of the antenna element when the antenna element is pulled outside of the case. Thus, the antenna element can be kept in a state of electrical continuity with the antenna holder, which is electrically connected to the matching device, at all times.

Abstract: An antenna assembly for use on a vehicle includes telescoping radiating sections that collapse toward an insulated mounting base, so that the radiating sections can be selectively extended. An impedance matching network with concentric outer and inner conductive tubular members slidably receives the telescopically collapsed radiating sections. Both tubular members are attached to the mounting base and electrically insulated therefrom and from each other. The inner tubular member is electrically connected to the radiating sections at a base end thereof. The outer tubular member has at least one longitudinal slot therein through which the central conductor of a transmission line is connected to the inner member. A ground contact is electrically connected to the outer tubular member. A slidable terminal that is selectively adjustable longitudinally along the outer tubular member is connected to the transmission line to select a signal insertion point.

Abstract: A motor driven antenna for vehicles including an antenna element, an antenna housing tube which stores the antenna element and is fixed to a mounting hole of the vehicle body, a motor mechanism mounted on the base of the antenna housing tube, which retracts and extends the antenna element housed in the antenna housing tube, and a coupling mechanism for coupling the casing for the motor mechanism to the antenna housing tube. The coupling mechanism includes a first vibration absorber provided between a housing tube holding section of the motor mechanism casing and the base portion of the antenna housing tube, a second vibration absorber which fits on the antenna housing tube at a position away from the first vibration absorber a specified distance toward the tip of the end of the antenna housing tube and a coupling member for connecting the second vibration absorber and the motor mechanism casing so that the coupling member holds the second vibration absorber therein.

Abstract: Converter apparatus for interconnecting a universal replacement power antenna to the original equipment components of a vehicle radio system or the like, and for automatically steering the electrical control signals to maintain the proper up-down operating function. The connector apparatus comprises an electronic converter module, a group of wire terminal connectors and a connector block, the latter consisting of a three lead, polarized female connector, compatible with an existing connector in the vehicle system. A pair of diodes are used in the electronic converter module to automatically steer control signals among three interconnecting wires between the original equipment antenna relay and the replacement antenna relay.

Abstract: A mobile antenna circuit for resonant transmitting from an RF signal source may comprise: an antenna having a base and at least first and second conductive sections one of which is extendable and retractable to lengthen and shorten the antenna; a motor operatively connected to one of the conductive sections for extending and retracting the antenna in response to control signals thereto; an impedance matching circuit coupling the RF signal source to the base of the antenna for matching impedance thereof at a specified frequency; and control components connected to the motor to produce control signals for extending and retracting the antenna section so as to resonantly tune the antenna at a specified frequency. The circuit may include a phase angle detector connected between the RF signal source and the impedance matching circuit for developing a voltage differential being fed to the control components for producing the control signals for extending and retracting the antenna section.

Abstract: A vertically extendible and retractable mast for supporting an antenna and coaxial cable connected thereto to receive and/or broadcast information and is particularly adapted for use by seismograph exploration crews for receiving data from portable transmitter units which may be located at substantial distances from the receiver with the mast being adapted for mounting stationarily or on a mobile vehicle. The mast and antenna is a multiple stage antenna with simultaneous movement of the sections of the mast with the coaxial cable being fed at the same rate that the upper end of the antenna mast moves with the specific arrangement of the extension or lifting cables, retracting cables, winch and coaxial cable producing a novel and unique extendible and retractable antenna mast.

Abstract: A multiband antenna mounting and feedline coupling arrangement includes a first transmission line segment secured in a mounting device for the antenna for coupling energy to and from the antenna. A second transmission line segment, extending, e.g., to grounded high band equipment, provides high band signal coupling with the first line and includes a direct current blocking capacitor in series in the ground return path of that second line segment, the capacitor having such a low impedance to high band energy that it presents negligible impedance to such energy. A third transmission line segment provides low band signal coupling with the first line by way of a part of the ground return path of the first line. A high band quarter wave, in the high band, filter stub transmission line is connected between the signal and ground return paths of the third transmission line adjacent to the point of coupling thereof to the first line.

Abstract: An automobile antenna including a cylindrical housing for storing an antenna element, an antenna extension wire for extending and retracting the antenna element, cables connected to the antenna element at one end and the other end to communication equipment, and a cable chamber for storing therein a part of the cables. The cable chamber includes a wind-up shaft with a spiral fin formed around the outer circumference thereof, and the cables are wound along the spiral fin such that the coil diameter of the cables around the wind-up shaft is reduced and increased along the spiral fin upon the extension and retraction operations of the antenna element.

Abstract: An extensible rod antenna system for vehicles including an extensible rod antenna element formed of conductive rods, an upper fitting member and a lower cylindrical fitting member clamping and holding the rod antenna to a fitting hole located on the vehicle wall, a drainage outlet provided on the side wall of the lower fitting member, and a drainage pipe connected to the drainage outlet which discharges outside of the vehicle. This extensible rod antenna system is improved in that it drains water leaking through the space between the extensible rod antenna element and the upper portion fitting member.

Abstract: A multistage extensible rod antenna system including a plurality of conductive rods which have different diameters, respectively, and are connected in a freely slidable manner to each other. Each of the conductive rods is provided, along its inner circumferential wall of the upper end portion, with first and second stepped portions of different diameters. The first and second stepped portions hold a first collar and a second collar, respectively with an elastic sealing ring therebetween. The upper end face of each of the rods is formed into an engaging portion to keep the collar from slipping off. The multistage extensible rod antenna system thus structured creates less compressive force on the elastic sealing ring, prolonging the elasticity of the sealing ring and extending the service life of the multistage extensible rod antenna system.

Abstract: A fully collapsible, telescoping asymmetrically loaded half-wavelength vertical antenna. A base of the antenna formed of telescope sections, carries at its upper end an integral, coaxial LC matching network. Coaxially telescoped within the base is a mast formed of multiple telescoping sections, which may be extended and secured in sequence from the ground by an unassisted user. The matching network includes a coil wound concentrically about a form at the upper end of the base, the mast having a lower section telescoped within the coil by a controllable extent for providing preselected capacitance with the base. The upper end of the base serves as the feedpoint.

Abstract: A portable radio is provided with a whip antenna that can be removed and replaced without requiring the disassembly of the radio. The antenna is removed and replaced through an opening in the radio housing, and it is secured in its assembled position by a fastener extending through another opening in the housing.

Abstract: This telescopic isolating switch is made from nestable tubular members (10, 11', 12') including a base member (10) connected to an electrical connection point, intermediate members (11', 12'), and an end member supporting an electrical contact. Each intermediate member (11', 12') contains two pulley wheels (110, 111) fixed close to respective ends thereof, together with an endless loop (114) passing over the two pulley wheels (110, 111) inside the member and attached at two diametrically opposite points (116, 117) to the ends of the two adjacent members (10, 12'). The lower pulley wheel (110) of the intermediate member (11') which is adjacent to the base member (10) being driven through the base member (10) by means of a gear system slidingly engaged on a rotary fluted shaft (104) which is fixed inside the base member (10) and which is driven by a drive motor.

Abstract: A seal for preventing intrusion of moisture between a lowermost or first movable tube section of a power operated antenna mast and an insulator between the first tube section and the panel through which the mast projects, the seal including a substantially inelastic polymeric insulator mounted on the panel with a bore therethrough surrounding the first tube section, an inside surface on the insulator perpendicular to the bore intersecting the latter at a lip extending through 360.degree. around the first tube section, and a substantially inelastic polymeric sleeve on and movable with the first tube section having an annular frustoconical seal shoulder engageable on the lip in an extended position of the first tube section to define a moisture seal between the latter and the insulator.

Abstract: An antenna defines a coaxial connector receptacle when the antenna is in a fully retracted position.

Abstract: An antenna comprises an antenna body telescopically movable between a fully retracted position and a fully extended position and having a free end. A BNC-type coaxial receptacle is mounted to the free end of the antenna body. A mounting base receives the BNC-type coaxial receptacle when the antenna is in the fully retracted and completes an electrical ground circuit to the BNC-type receptacle.

Abstract: An extensible and retractable rod comprising an outer tubular section and an inner section of substantially constant outside diameter telescopically received in the outer section for extension and retraction relative thereto. The outer section has a first internal shoulder spaced from but relatively close to one end of the section, and a second internal shoulder spaced substantially farther away from said one end, said outer section being dimensioned to have a first inside diameter between said one end of the section and the first shoulder, a second inside diameter greater than the first between the first and second shoulders, and a third inside diameter greater than the second between the second shoulder and the other end of the section. The first inside diameter of the outer section is dimensioned for a relatively close clearance fit between the sections, and the second inside diameter of the outer section is dimensioned for a relatively loose clearance fit between the sections.

Abstract: A telescoping, multi-tube, vehicle radio antenna adapted for power extension and retraction includes an outer metallic tube having inward bent upper end defining an inner annular bearing surface and an inner metallic cylindrical member in telescoping relationship within the outer tube, the cylindrical member having an expanded diameter rigid lower end which defines an outer annular bearing surface and further being slidably supported in the first tube by the axially separated bearing surfaces. The cylindrical member further has a circumferential shoulder spaced upwardly from its lower end and a circumferential sealing element carried on the upper side of the shoulder for compression between the shoulder and the inward bent upper end of the outer tube when the antenna is extended to prevent the entry of water into the antenna interior. The sealing element thus separates from the outer tube and contributes no sliding friction during the antenna extension and retraction.

Abstract: An improved power actuated antenna installation, particularly for automotive vehicles, of the type including a mast jacket rigidly attached to body structure of the vehicle, a telescoping antenna disposed on the mast jacket, a power actuator disposed on an L-shaped housing with a first leg parallel to the mast jacket and a second leg below the mast jacket, and a flexible drive element projecting into the mast jacket through a guide bushing at the lower end thereof for attachment to the antenna and into the second leg of the housing for attachment to the actuator, the improvement residing in the provision of elastomeric grommets between a pair of pins on the mast jacket and a pair of rigid arms on the first leg of the housing and in the provision of a combination seal and grommet between the drive element and housing generally immediately below the mast jacket, the grommets and the combination seal and grommet effecting resilient support of the actuator on the mast jacket in a manner discouraging transmission

Abstract: A portable radio link system mast, particularly for use in the field, employing mast tube elements which are lifted, one after the other, by means of a lifting device installed in the head of the stand and, after a certain height is reached, are connected with always the next mast tube element. The lifting device consists of three frictionally self-locking pawls arranged on top of each other, a carrying pawl, a lowering pawl and a lifting pawl, which permit a slipless lifting, lowering and locking of the mast tube elements in connection with springs. A cardigan cam lever with a feeler stud draws attention to a wrong connection of the mast tube elements, and a mast tube element in the range of the lifting device can only be pushed out of the head of the stand after a correct contact is established with the following mast tube element.