Abstract: The invention relates to a wind turbine (1) comprising stationary means such as a nacelle (3) and a tower (2) comprising stationary lightning protection means (46), and rotating means such as a rotor including at least one wind turbine blade (5) and shaft means (14), each of said at least one wind turbine blade (5) comprising rotating lightning protection means (47). The stationary and rotating lightning protection means (46, 47) comprise contact surfaces (17, 18) connected by lightning connection means (15). The lightning connection means (15) comprises at least two contact means (19, 19a, 19b) adapted for connecting said rotating and stationary lightning protection means (46, 47).

Abstract: An electrical current return circuit for on-board avionic devices. A conductive metallic bar is attached to a conductive composite structure of an aircraft via insulating fixtures. The conductive metallic bar may be electrically coupled to on-board avionic devices so that a circuit is formed. A number of on-board devices may be connected to the circuit by way of various connector elements. The conductive metallic bar may also form part of a power grid.

Abstract: An energy collection system may collect and use the energy generated by an electric field. Collection fibers are suspended from a support wire system supported by poles. The support wire system is electrically connected to a load by a connecting wire. The collection fibers may be made of any conducting material, but carbon, graphite, carbon/carbon, or a mixture thereof are preferred. Diodes may be used to restrict the backflow or loss of energy.

Abstract: A lightning protection circuit for electric fence energizers used with electric fencing systems is provided. The circuit includes a protective combination having at least two electrical components connected in series. The protective combination allows induced voltage from lightning strikes to be effectively spread across a first of the electrical components and a switch of the fence energizer, so as to limit peak levels of current drawn to a second of the electrical components.

Abstract: An energy collection system may collect and use the energy generated by an electric field. Collection fibers are suspended from a support wire system supported by poles. The support wire system is electrically connected to a load by a connecting wire. The collection fibers may be made of any conducting material, but carbon and graphite are preferred. Diodes may be used to restrict the backflow or loss of energy.

Abstract: The present invention concerns a method of producing a lightning diverter for conducting a lightning-induced electrical current, which is to be placed on structures such as wings on wind turbines, aircraft components, radomes and the like with the purpose of lightning protection. The method comprises the steps of making a plurality of holes in a plate of an electrically conductive material, filling said holes at least partly with one or more electrically non-conductive materials, and then finally dividing the plate—preferably into strips. The lightning diverter obtained hereby consists of a layer of electrically non-conductive material with a plurality of isolated segments of electrically conductive material. The invention further relates to a diverter strip with isolated segments of concave shapes being advantageous because of the good connection between the segments and the non-conductive material.

Abstract: The invention relates to a system (1) for conducting lightning currents and/or fault currents away from a roof area (2) and/or façade area of a building (3) to the ground (4). According to the invention, the system is equipped with at least one strip (5), which is laid in the roof area (2) and/or façade area of the building (3) and at least one potential compensation system for the building (3). The strip (5) comprises at least one electrically conductive layer for shielding electromagnetic radiation and the strip (5) is connected to the potential compensation system in such a way that lightning currents and/or fault currents can be conducted away via the strip (5) and the building potential to the ground (4).

Abstract: An appliqué for forming a surface coating to a substrate is disclosed. The appliqué contains a sectioned metal foil that provides a large area electrical circuit for connecting electrical devices. The appliqué may provide additional functions including lightning strike protection. The substrate may be an aircraft surface.

Abstract: An electrical insulating device for a linear component forming part of a fuel system subjected to risks of possible external electrical discharges formed by a part (13) made of insulating material attached to two metal flanges (15, 17) that allow inserting the device (11) between two parts of said linear component, said part (13) being formed by a cylindrical body (21) with a castellated crown (23) on its outer side, formed by longitudinal (25) and transverse (27) segments, and said metal flanges (15, 17) having transverse projections (31, 33) facing the transverse segments (27) of the castellated crown (23) for facilitating their attachment by suitable means (39).

Abstract: Provided are an equipotential ground system and a method of constructing the same capable of equalizing potential of all positions when the ground system is configured in a mesh manner. The equipotential ground system includes: a mesh having a plurality of row lines, and a plurality of column lines installed to cross the row lines to form intersection parts electrically connected to the row and column lines; first ground rods connected to corners of the mesh; and a plurality of second ground rods having a larger ground resistance than the first ground rods and connected to the outermost intersection parts of the mesh, which are disposed between the first ground rods.

Abstract: An electrical arc flash protection blanket for protecting workers from electrical arc flashes. The blanket is composed of two or more layers where the layer closest to the electrical arc source is of a fiberglass material and the remainder of the layers are of fiberglass and/or a flame-retardant (FR) materials. The layers overlap so that the they can be attached around the entire perimeter. Preferred fiberglass fabrics are woven with a warp yarn break strength between about 0.7 and 1.5 times the fill yarn break strength. FR materials include FR cotton, para-aramids, and meta-aramids. A fastening structure is used to install the blanket for use. Contemplated fastening structures include straps with temporary fasteners around the blanket perimeter and eyelets. Optional integral handles facilitate carrying and installation.

Abstract: A device for installation of signalization spheres and verification of the status of a lightning-rod cable. A supporting structure, consisting of two bases equidistant, parallel to each other, linked to each other by axial segments, the axial segments acting as supports for activation engines, respectively, a grounding and idler tension system including a structure formed by two parallel rods that move along the vertical direction linked to two bases equidistant and parallel to each other in its intermediate portion through an axis. In its superior extremity through an axis and presenting in its inferior extremity slots for the introduction of an axis of a wheel. A first axial segment being equipped in its intermediate portion with a threaded rod which is linked it its inferior extremity to the axial segment of the bases superiorly equipped with a crank and spring. A fork is articulated over a pivot to the external part of the bases whereto are projected the feeding system.

Abstract: A streamer discharge type lightening rod is disclosed, which is capable of generating lots of ions so that a certain object can be effectively protected from lightening in such a manner that an induction current is formed using ions in the air as thundercloud is formed, and ions having polarities corresponding to the ions in the air are greatly generated at a surface of the lightening rod, and a streamer by a corona discharge is increased at a surface of the thundercloud for thereby inducing lightening from a thundercloud similar to when lightening is naturally generated.

Abstract: Apparatus for providing an electrical ground connection through a pipe or conduit system including electrically non-conductive portions. A pipe fitting, preferably although not necessarily made of electrically non-conductive material, is equipped with an electrically conductive member extending within the fitting for intimate contact with a fluid carried by the fitting. A portion of the conductive element extends outside the pipe fitting, for connection to a suitable electrical ground. The conductive element within the fitting thus is at electrical ground potential, and that ground potential is transferred through an electrically conductive fluid medium within the pipe system to any electrically conductive element of the pipe system.

Abstract: A grounding electrode suited for installation in very hard or rocky soil is a long conductive metal rod having a drilling bit at one end and a head adapted to mate with a drilling tool, preferably a hammer drill. The grounding electrode, together with a suitable connecting wire and a clamping device clamping the wire to the grounding electrode form an electrical grounding system for a home or commercial structure.

Abstract: A wiring system is provided where at least one device connector and at least one device connector are interconnected. The wiring system has at least one main harness with at least one group of wires aligned in a substantially parallel direction, and at least one sub harness with at least one group of wires forming at least one wire crossover. A coupling structure is further provided to couple the main and sub harnesses together to form a complete wiring harness that extends between the first and second device connectors. The wire crossover is provided only in the sub harness, so that the main harness is free of any wire crossovers.

Abstract: A method of installing signalization spheres on energized transmission lines. A supporting structure, consisting of two bases equidistant, parallel to each other, linked to each other by axial segments, the axial segments acting as supports for activation engines, respectively, a grounding and idler tension system including a structure formed by two parallel rods that move along the vertical direction linked to two bases equidistant and parallel to each other in its intermediate portion through an axis. In its superior extremity through an axis and presenting in its inferior extremity slots for the introduction of an axis of a wheel. A first axial segment being equipped in its intermediate portion with a threaded rod which is linked it its inferior extremity to the axial segment of the bases superiorly equipped with a crank and spring. A fork is articulated over a pivot to the external part of the bases whereto are projected the feeding system.

Abstract: Disclosed is a lightning arrester. The lightning arrester safely discharges earth charge of a main electrode section and an auxiliary electrode section regardless of a variation of charge contained in air, so charge charged in a thundercloud is safely discharged into the earth even if the thundercloud is located far-remote from the earth.

Abstract: An electrostatic charge deionizing lighting conductor has two frameworks having different geometries and being electrically separated from one another, insulators which electrically separate the frameworks from one another and must support the frameworks in the insulators and being electrically insulated, each of the insulators being provided with a variable dielectric, so that each of the insulators, when it counter balances an energy within it, annuls a saturation of electrical charges in an atmosphere of a protected area which are responsible of thunderbolt formation, its scope being variable according to a geographic area to be protected and the values being of about 650 meter radius.

Abstract: A tower has a concrete base (14) supported within the Earth and a frame (5) extending vertically from the base into the atmosphere. A ground conductor (12) runs alongside the frame. A first ground rod (10) is driven into the Earth and is connected to the ground conductor to charge the ground conductor electrically negative. A second ground rod (10) extending vertically above the frame is connected to the ground conductor to be charged electrically negative. A positive conductor (21) running alongside the frame is connected to a positively charged generator (16). A positive rod (22) extending vertically above the frame is connected to the positive conductor to be charged electrically positive. The second ground rod discharges protons from lightning into the Earth via the ground conductor and the first ground rod, and the positive rod attracts and discharges electrons remaining its vicinity into the generator via the positive conductor.

Abstract: The present invention relates to lightning protection, and in particular, to lightning protection using vacuum plasma. The lightning protection of the present invention impairs an electric field created by an atmospheric condition, such as a charged cloud, by polarizing vacuum plasma that is under the effect of the electric field. The polarized plasma neutralizes or diminishes the electric field in the proximity of a protected object and thus prevents the electric field from reaching a sufficient level where the air near the protected object fails to act as an insulator. In this way, the lightning strike is prevented from hitting an object surrounded by or in close proximity to the plasma.

Abstract: The subject invention pertains to a method and apparatus for lightning protection. The subject method and apparatus can be utilized to provide lightning protection for a marine vessel, other structures near water, and/or land-based structures. In a specific embodiment of the subject invention, an electrode design for allowing the electric current caused by a lightning strike to be grounded to water can be employed. The subject grounding electrodes can be employed such that the electrodes are not completely immersed in the water during normal operation of the marine vessel. In a specific embodiment of the subject invention, such grounding is not in contact with the water at all. The specific embodiment of the subject electrode is designed to enhance sparking initiation. In a specific embodiment, the subject electrode is designed to be at least partially, and in some embodiments substantially, insulate from the water, such that an area of the electrode used as a spark channel is exposed.

Abstract: A lightning suppression system including an instrument, a first cable electrically connected to the instrument, an enclosure having an interior volume, a first coil positioned within the enclosure and electrically interconnected to a first wire of the first cable, a second coil positioned within the enclosure and electrically interconnected to a second wire of the first cable, and an electronic device electrically interconnected by a second cable to the first and second coils. A conductive grit fills a portion of the enclosure around the first and second coils. A grounding rod is electrically connected by a conductive line to the enclosure.

Abstract: A system for suppressing the effects of lightning including an antenna, a cable extending from the antenna, an enclosure having an interior volume, a coil of conductive wire received within the interior volume of the enclosure, and a piece of electronic equipment suitable for receiving from or transmitting through the antenna. The electronic equipment is interconnected to a lead from the coil of conductive wire. The coil of conductive wire has another lead connected to the cable. The cable is a coaxial cable or a heliaxial cable. A conductive grit or steel shot fills a portion of the interior volume of the enclosure around the coil of conductive wire. A grounding rod is electrically interconnected to at least one of the cables, the enclosure and the electronic equipment.

Abstract: A shelter for individuals or groups of people caught in the open in inclement weather especially when there is a danger of lightning. The shelter includes an elongate electrically-conductive member for supporting a canopy, the elongate electrically-conductive member being configured as a lightning conductor; an electrically-conducting floor; and a coupling member for electrically connecting the elongate electrically-conductive member to the electrically-conducting floor. The coupling member includes a flange extending laterally away from the elongate electrically-conducting member, over the electrically-conductive flooring, to provide an enlarged footprint of engagement with the electrically-conducting floor.

Abstract: A lightning rod system including both methods and specific types of lightning rod protection apparatus, which address the need for lightning rod safety features to deter impalement and minimize injury when humans inadvertently fall upon or strike the projecting air terminal through use of a hebetative contiguous impact surface (10) on an end cap(s). The system involves lightning rod system components such as humanized quantal rod (3) or coil spring coupler (13) engineered to be responsive within the range of forces achieved when a human of average size and weight falls onto the projecting air terminal from a standing surface level with that on which the lightning rod system is mounted to. The lightning rod system also involves a method and engineered components to retrofit existing lightning rod assemblies.

Abstract: A lightning suppression attenuator including an enclosure having an interior volume and a coil of conductive wire received within the interior volume of the enclosure. The coil has a first lead extending outwardly through a first opening of the enclosure and a second lead extending outwardly of a second opening in the enclosure. A conductive grit fills a portion of the enclosure. The coil has a central void with turns of wire extending around the central void. The first lead is connected to a first discharge grounding system. The second lead is connected to a second discharge grounding system. The rigid foam material is affixed within the enclosure around the conductive grit and over the coil.

Abstract: A shelter for individuals or groups of people caught in the open in inclement weather especially when there is a danger of lightning. The shelter comprises an elongate electrically-conductive member for supporting a canopy, the elongate electrically-conductive member being configured as a lightning conductor; an electrically-conducting floor; and a coupling member for electrically connecting the elongate electrically-conductive member to the electrically-conducting floor. The coupling member includes a flange extending laterally away from the elongate electrically-conducting member, over the electrically-conductive flooring, to provide an enlarged footprint of engagement with the electrically-conducting floor.

Abstract: An electronic signal filter is provided that includes a metal housing which has been adapted to be electrically grounded, and a circuit board positioned within the housing. The circuit board includes a first area and a second area, and has an electrically conductive trace formed on a portion of a top surface of the circuit board that provides electrical communication between the first and second areas of the circuit board. The filter further includes a metal shield connected to the housing, located between the first and second areas of the circuit board. The metal shield extends in a direction substantially perpendicular to the plane of the circuit board and has a slot formed therein for receiving the portion of the circuit board on which the electrically conductive trace is formed. The slot is dimensioned to provide a space between the metal shield and the conductive trace.

Abstract: The subject invention pertains to a method and apparatus for lightning protection. The subject method and apparatus can be utilized to provide lightning protection for a marine vessel, other structures near water, and/or land-based structures. In a specific embodiment of the subject invention, an electrode design for allowing the electric current caused by a lightning strike to be grounded to water can be employed. The subject grounding electrodes can be employed such that the electrodes are not completely immersed in the water during normal operation of the marine vessel. In a specific embodiment of the subject invention, such grounding is not in contact with the water at all. The specific embodiment of the subject electrode is designed to enhance sparking initiation. In a specific embodiment, the subject electrode is designed to be at least partially, and in some embodiments substantially, insulate from the water, such that an area of the electrode used as a spark channel is exposed.

Abstract: A lightning shelter that is useful to provide temporary shelter on golf courses and for people engaged in other outdoor activities. The shelter includes a floor secured to the ground, walls extending upward from the floor and a roof that are connected together to define a completely enclosed, lightning protected region therein. The floor, walls and roof include metal electrically conductive material at least 0.03″ thick and having a maximum spacing between portions of conductive material of 4″. The metal electrically conductive material of the floor, walls and roof are electrically connected in a unitary electrical system so as to provide a Faraday cage enclosure that protects against lightning, shielding occupants within the shelter from very high voltage surges and protecting against internal arcs.

Abstract: An improved grounding electrode system includes a moisture collector connected to a grounding electrode. The electrode may have a perforated conductive tubular assembly having at least two circular conductive collars. The whole electrode assembly is buried in the earth with the top end exposed and surrounded by an osmotic conductor. The tubular assembly can be filled with a chemical which enhances the soil conductivity. The moisture collector is preferably a mesh screen to condense moisture from the air and pipe it to the inside of the grounding electrode and/or to the surrounding soil. An osmotic conductor may be inside the electrode and/or in the surrounding soil.

Abstract: A lightning suppression attenuator including an enclosure having an interior volume and a coil of conductive wire received within the interior volume of the enclosure. The coil has a first lead extending outwardly through a first opening of the enclosure and a second lead extending outwardly of a second opening in the enclosure. A conductive grit fills a portion of the enclosure. The coil has a central void with turns of wire extending around the central void. The first lead is connected to a first discharge grounding system. The second lead is connected to a second discharge grounding system. The rigid foam material is affixed within the enclosure around the conductive grit and over the coil.

Abstract: The present invention provides a method and apparatus for mobile lightning protection. In one embodiment of the present invention, a lightning interception rod is positioned above a vehicle. In one embodiment, the rod connects to four down-conductors to conduct the current supplied by the lightning towards the ground. In one embodiment, the four down-conductors are positioned in a rectangular configuration. In one embodiment, down-conductors are covered by a insulating material. In one embodiment, the insulating material is a 3 mm thick layer of polymer. In one embodiment, one or more chains are attached to the vehicle and allowed to contact the ground. In one embodiment, two chains are attached to the vehicle. One chain is positioned at the front of the vehicle and another chain is positioned at the back of the vehicle.

Abstract: A lightning rod system including both methods and specific types of lightning rod protection apparatus, which address the need for lightning rod safety features to deter impalement and minimize injury when humans inadvertently fall upon or strike the projecting air terminal through use of a hebetative contagious impact surface (10) on an end cap(s). The system involves lightning rod system components such as humanized quantal rod (3) or coil spring coupler (13) engineered to be responsive within the range of forces achieved when a human of average size and weight falls onto the projecting air terminal from a standing surface level with that on which the lightning rod system is mounted to. The lightning rod system also involves a method and engineered components to retrofit existing lightning rod assemblies.

Abstract: The present invention refers to a device (10) of installation of signalization spheres and verification of the status of lightning rod cable (110), comprising a supporting structure (12), consisting of two bases equidistant, parallel to each other 14, 16, linked each other by axial segments (18, 20, 22 and 24), said axial segments (20 and 24) acting as supports for activation engines (26 and 28), respectively, an earthing and idler tension system comprising a structure (30) formed by two parallel rods (32 and 34) that move along the vertical direction linked to two bases equidistant and parallel to each other (14, 16) in its intermediate portion through axis (22), in its superior extremity through axis (36) and presenting in its inferior extremity slots (38) for the introduction of an axis (40) of a wheel (42), said first axial segment (22) being equipped in its intermediate portion with a threaded rod (44) which is linked it its inferior extremity to the said axial segment (22) of said bases 14, 16, superior

Abstract: To prevent lightning from destroying equipment in a housing structure, a shield structure is built within the housing structure for enclosing electrical conductors that may allow surge currents to be routed into the housing structure. The shielding structure is constructed of ferrous or non-ferrous metal and preferably of the same material as that of the ground plane of the housing structure to which the electrical conductors are mounted. A terminal cover strip for enhancing efficient grounding is also disclosed.

Abstract: To prevent lightning from destroying equipment in a housing structure, a shield structure is built within the housing structure for enclosing electrical conductors that may allow surge currents to be routed into the housing structure. The shielding structure is constructed of ferrous or non-ferrous metal and preferably of the same material as that of the ground plane of the housing structure to which the electrical conductors are mounted. A terminal cover strip for enhancing efficient grounding is also disclosed.

Abstract: A lightning rod system including both methods and specific types of lightning rod protection apparatus, which address the need for lightning rod safety features to deter impalement and minimize injury when humans inadvertently fall upon or strike the projecting air terminal through use of a hebetative contagious impact surface (10) on an end cap(s). The system involves lightning rod system components such as humanized quantal rod (3) or coil spring coupler (13) engineered to be responsive within the range of forces achieved when a human of average size and weight falls onto the projecting air terminal from a standing surface level with that on which the lightning rod system is mounted to. The lightning rod system also involves a method and engineered components to retrofit existing lightning rod assemblies.

Abstract: A structural joint for the transmission and control of high current flows in a carbon fiber or carbon fiber hybrid composite structure, said joint including at least two composite structures comprising a multiplicity of resin bonded carbon fiber plies, an adhesive applied there between and capable of conducting high currents said adhesive comprising a conductive carrier film comprising carbon fibers, wherein the electrical conductivity of the adhesive is comparable with that of the adjacent composite structures.

Abstract: A means and method for rigidly elevating a structure includes a base member securable in the ground and which has a portion extending above the ground. A pole section, having a bore inside a lower end, and an upper end, can be stacked upon the base means upwardly by slip fitting the pole section onto the base end and securing it in place. A flexible, easily transportable and durable system is thereby created for elevating structures.

Abstract: To prevent lightning from destroying equipment in a housing structure, a shield structure is built within the housing structure for enclosing electrical conductors that may allow surge currents to be routed into the housing structure. The shielding structure is constructed of ferrous or non-ferrous metal and preferably of the same material as that of the ground plane of the housing structure to which the electrical conductors are mounted. A terminal cover strip for enhancing efficient grounding is also disclosed.

Abstract: An electrical and electronic equipment installation pad includes a precast concrete support slab 40 having an electrically conductive pathway disposed therein. The pathway may be comprised of a plurality of steel reinforcing rods 42 welded to one another to form a grid 44. Coil loop inserts 46 disposed within the slab 40 and welded to the grid 44 receive electrically conductive bolts for securing the equipment 20 on the slab 40. Galvanized inserts 48, 50 having bolts 52, 54 extending therefrom are also disposed within the slab 40 and welded to the grid 44. Ground rod leads 34 from ground rods 36 installed in the ground proximate to the pad 10 are connected to the galvanized inserts 48, 50 providing a path for fault currents from the equipment 20 through the grid 44 to ground. The pad 10 may be used to install equipment 20 at a desired location by first securing the equipment 20 on the pad 10 while the pad 10 is at a location remote from the desired location and then moving the pad 10 to the desired location.

Abstract: A lightning shelter for people is formed from a plurality of elongate electrically conductive members first ends of which are held conjoined between a pair of metal plates. Each member extends away from and depends from its first end to define a frame and the second end of each member has an electrically conductive spike drivable into the ground on which the shelter stands. The outer surface of each elongate member is electrically insulated e.g. with a layer of polyethylene. A further electrically conductive member is removably mountable on the frame on the plates to extend normally away from said frame. In moving from its first to its second end each elongate member extend firstly through a curved portion (quarter circle) and then through a generally straight portion.

Abstract: A lightning rod is enshrouded by a large number of electrically isolated metallic points. When a storm cloud passes overhead, a charge is induced in the lightning rod, causing the metallic points positioned near the lightning rod to emit sparks, causing the air about the points to become ionized. These produced ions are accelerated by an electric field produced by two metallic plates, one being electrically connected to the induced charge in the lightning rod and the other being electrically isolated from the charge induced in the lightning rod. The acceleration of the produced ions is strong enough to produce more ions through an avalanching effect created when ions collide with other air molecules in the presence of the strong electric field.

Abstract: The present invention relates to a lightning protection device comprising a ground plate having a plurality of parallel grooves machined therein. Each of the grooves has spaced apart, sharp edges for bleeding electrical discharges from a lightning strike to ground. The ground plate may be connected to an air terminal secured to a structure or a marine vessel via a down conductor. The ground plate may be buried in the ground or may be joined to a structure, such as the hull of the vessel.

Abstract: Ionization clusters have a plurality of ionization points which act to dissipate lightning charges into the air and prevent a lightning strike. A tree-like structure has a central support tower. One ionization cluster is mounted to the top of the tower. Successive arrays of second, third and N tiers of ionization clusters are mounted to the tower. The resultant tree-like structure forms a bell-shaped force field of equal voltage potential during a lightning storm. The force field dissipates a lightning strike.

Abstract: A lightning strip particularly for protection of aircraft radomes has an attaching face adapted to be attached to the surface to be protected from lightning and an exposed face. The strip is made of a thermoplastic polymer filled with conducting particles. It has a terminal designed to ensure grounding that is shaped by heating and molding to match the shape of the head of a screw. The greatest height of the strip is greater than the thickness of a layer of water or ice that could cover the surface to be protected in wet weather conditions, namely approximately 2.5 mm or more.

Abstract: A new Lightning Protection Device for providing protection to individuals against lightning strikes. The inventive device includes a plurality of electrically conducting bands being spaced apart and extending outwardly and downwardly either from a center post over the canopy support frame of a golf cart or from a plurality of spaced apart ribs radiating outwardly from the ferrule of an umbrella. The electrically conducting bands extend downwardly in an elongated configuration to terminate at or near ground level. The electrically conducting bands together with the center post or the ferrule form an electrically conducting cage or envelope to surround the user within an electrically protected volume of space in the event of a lightning strike.

Abstract: An improved mechanism for adjusting the distance between the electrodes of lightning arresters, particularly of the horn gap type, used to protect ungrounded antenna systems. The adjustment mechanism is insulated from the hot electrode so that the hot electrode can be moved to adjust the gap between the electrodes while the antenna is radiating power. The hot electrode is attached to an insulator placed on a base. The position of the base on a slide track can be changed by use of a screw mechanism. Springs help keep the base in place after the adjustment is made.