HB9XBG Antenna

It was developed by the Swiss radio amateur Walter Kägi, whose call sign HB9XBG is also the designation of the antenna.

The structure of the HB9XBG antenna was first published in 2020 in HBradio, the journal of the Union of Swiss Short Wave Amateurs.

The HB9XBG antenna is based on the use of a speaker audio cable with a strand cross-section of 2 × 2.5 mm2 and PVC insulation.

A resonant trap L2/C2 eliminates the common mode current at the lower end of the antenna.

Source:[2] • Low-impedance feed (100 Ω) • High bandwidth, flat SWR curve (900 kHz, SWR less than 1.5) • No antenna tuner required • High level of efficiency (virtually no SWR losses) • Installation only a few centimetres above ground (ground-neutral) • Functions well over rocky terrain and ideal for Summits on the Air • No radials/counterpoises required • Low take off angle of radiation, ideal for DX • 6 dBi antenna gain over ideal terrain • Requires little space • Rapid setup and dismantling • Suitable for portable operation • Ideal for self-construction