Abstract: 12 and 17 meter adapter assemblies for a vertical antenna which includes an air wound inductance coil and winged capacitor straps. The adapter assemblies include a coil and wing capacitor straps at one end of the coil where the one end of each coil connects to the antenna and the other end of each coil, including the wing capacitor straps, mechanically connects to the antenna and is electrically insulated from the antenna.

Abstract: A ten-band vertical antenna includes completely automatic band switching for the amateur radio frequencies of eighty, seventy-five meters, forty meters, thirty meters, twenty meters, seventeen meters, fifteen meters, twelve meters, ten meters and six meters. The vertical antenna has a low angle of radiation and a low standing wave ratio on all frequencies which provides for direct coaxial cable transmission line feed. The seventy-five-meter, a switchable eighty-meter, and forty-meter inductor-capacitors are in parallel, while the thirty-meter inductor-capacitor is in series with a portion of the forty-meter circuit thereby providing inductive reactance for operation on eighty meters, seventy-five meters, forty meters, and thirty meters with a series inductor-capacitor connected between an upper vertical radiating element and the forty-meter inductor while permitting simultaneous resonance on each of the three higher frequencies of twenty, fifteen and ten meters.

Abstract: Antenna for operation on a plurality of frequencies, the antenna including apex fed opposing swept elements and a plurality of stubs parallel to a central element, a plurality of capacitors connected between one end of the central element and ends of the stubs, and a coaxial cable connected to the opposing swept elements. Each swept element has a triangular configuration with a central element running from the apex to the base of the triangle at a perpendicular intersection. Plural matching stubs connect from the coaxial fed apex and parallel along the central tube, secured at the other end with clamps or capacitors. Ceramic doorknob capacitors connect between the coaxial fed apex and a free end of the first stub and between the first and second stub ends. A hairpin coil can be utilized between the apex fed and the first capacitor. A matching end can connect across the feed point at a common matching stub point for the swept elements.