Abstract: A mobile antenna adapted to be mounted to a motor vehicle includes a vertical radiating element, an antenna base from which the radiating element extends, and a cylindrical mounting pin for mounting the base to a body panel of the vehicle. The mounting pin establishes at one end a first quick-release bayonet-type connection to the antenna base, and a second quick-release bayonet-type connection to a skirt member positioned between the base and the body panel. The base includes a socket for receiving the pin, and a contact member within the socket which engages tabs contained on a first electrically conductive end cap molded into the pin housing to mechanically and electrically connect the pin to the base. The other end of the pin includes a second electrically-conductive end cap which receives a coaxial cable and establishes an electrical connection between the shield of the cable and the inside surface of the body panel.

Abstract: A mounting adaptor for mounting a mobile antenna to an external frame member such as the support arm of a side view mirror or the frame of a carrier rack, or to the rain gutter of a motor vehicle roof, includes a housing from which an adjustable band clamp extends. When the adapter is mounted on an external frame member the band clamp is attached at its free end to the housing and drawn tight around the frame member. When the adapter is mounted on a rain gutter an integral mounting shoe projecting from the housing is seated under the gutter and the adaptor housing is drawn toward the gutter by the band clamp so as to secure the mounting shoe in position.

Abstract: A mobile antenna includes a radiating element which can be adjusted to an effective length to tune the antenna to a desired operating frequency without changing the physical length of the element. The radiating element is slidably received in a sleeve member positioned within a central bore having a tapered end of progressively decreasing diameter within the antenna base. The radiating element is locked in position by a deformable rim portion of increased diameter on the sleeve which is drawn into the tapered end of the bore and clamped around the radiating element by means of an axially-aligned bolt threaded into the opposite end of the sleeve. The bolt is preferably accessible only when the antenna is removed from its mounting base to discourage tampering with the antenna.

Abstract: An angularly adjustable antenna mounting assembly for mounting a mobile antenna to the exterior surface of a motor vehicle includes a semi-hemispherical mounting shell. The antenna base is secured to the exterior surface of the shell by a pin member which extends through the shell and is retained therein by a retaining plate biased against the interior surface of the shell. The antenna is connected to the other end of the pin member by a quick-release bayonet connection which also serves to establish electrical connection to the antenna. The mounting angle of the antenna is adjusted by adjusting the location of the bridging plate within the shell.

Abstract: A mobile antenna includes a radiating element and an inductance winding for tuning the radiating element for operation on a desired frequency. The inductance winding is supported within the base of the antenna by a core assembly and an overmold layer within which the turns of the winding are partially embedded. The winding is preferably formed with a relatively large diameter and of relatively heavy gauge wire, and the winding support core is preferably formed with a chamber concentric to the winding to improve the electrical efficiency of the winding, and hence the radiating efficiency of the antenna.

Abstract: A precision injection-molded form for an inductance coil comprises a cylindrical core member having a surface of relatively low dimensional precision, and a thin plastic layer molded over the surface to provide a surface of high dimensional precision for supporting the windings of the coil. Metal insert-members having threaded axial bores and radially-extending wing portions are provided at either end of the core to establish electrical contact with the winding and a mounting capability for the assembly. The coil form is formed by injection molding techniques and apparatus which provide for axial compression of the assembly prior to molding to obtain a predetermined longitudinal dimension, and for equalization of forces exerted during molding to prevent longitudinal deformation.

Abstract: A precision injection-molded form for an inductance coil comprises a cylindrical core member having a surface of relatively low dimensional precision, and a thin plastic layer molded over the surface to provide a surface of high dimensional precision for supporting the windings of the coil. Metal insert-members having threaded axial bores and radially extending wing portions are provided at either end of the core to establish electrical contact with the winding and a mounting capability for the assembly. The coil form is formed by injection molding techniques and apparatus which provide for axial compression of the assembly prior to molding to obtain a predetermined longitudinal dimension, and for equalization of forces exerted during molding to prevent longitudinal deformation.