Abstract: An antenna comprising: a hollow conductive chamber having an upper end and a lower end, wherein the lower end is open; a shorting strap electrically connected to the upper end; a conductive center member running through the chamber and electrically connected to the shorting strap; a conductive ground plane having a top surface and a bottom surface, wherein the top surface is separated from the lower end of the chamber by a gap; and a first solid insulator connected to the chamber and the top surface of the ground plane such that the first insulator fills the gap and fills the lower end and an interior portion of the chamber.

Abstract: An antenna comprising: a hollow conductive chamber having an upper end and a lower end, wherein the lower end is open; a shorting strap electrically connected to the upper end; a conductive center member running through the chamber and electrically connected to the shorting strap; a conductive ground plane having a top surface and a bottom surface, wherein the top surface is separated from the lower end of the chamber by a gap; and a first solid insulator connected to the chamber and the top surface of the ground plane such that the first insulator fills the gap and fills the lower end and an interior portion of the chamber.

Abstract: A Method of Tuning a Frequency Agile Electrically Small Tactical AM Broadcast Band Antenna System (NC#102174) comprising determining a desired operating frequency for a frequency agile electrically small tactical AM broadcast band antenna system; configuring tophat jumpers of the frequency agile electrically small tactical AM broadcast band antenna system to operate near the desired operating frequency; erecting an antenna of the frequency agile electrically small tactical AM broadcast band antenna system; transmitting a signal through the frequency agile electrically small tactical AM broadcast band antenna system; adjusting inductor values of an antenna tuning unit of the frequency agile electrically small tactical AM broadcast band antenna system so that the frequency agile electrically small tactical AM broadcast band antenna system operates at the desired operating frequency.

Abstract: A Frequency Agile Electrically Small Tactical AM Broadcast Band Antenna System (NC#098978) comprising a transmitter, antenna, plurality of mast wires and configurable tophat assembly. The transmitter is designed to transmit radio frequency signals. The antenna tuning unit is operatively coupled to the transmitter and designed to tune the apparatus to a desired frequency. The plurality of mast wires operatively is coupled to the antenna tuning unit and designed to receive and output radio frequency signals. The configurable tophat assembly is operatively coupled to the plurality of mast wires. The configurable tophat assembly comprises a tophat disc comprising a conductive material, a plurality of tophat wires comprising a conductor material and a plurality of tophat jumpers designed to help configure said plurality of tophat wires to different lengths by providing electrical open and electrical short states.