Half Square HF antenna 20m Band

The half square has a beamwidth of about 60° and a gain of about 4dB. Apparent gain for DX (over single verticals or low horizontal antennas) will seem to be greater.

The Half Square antenna is a great wire antenna for the DX edge. No need for a tower, rotor, and beam to get  DX on the 20 meter band .

The vertical angle of radiation is low, in the 20° to 30° range, depending on the conductivity of the local earth.

The Half Square antenna is a wire antenna with two vertical radiators fed in phase. One vertical element ( 1/4 wave ) is fed at the top where it is attached to an SO 239. The other side of the SO 239 is attached to a horizontal half wave phasing line and then connected to another vertical element ( 1/4 wave ) aiming down to the ground. So basically what you have is two vertical elements spaced one half wave apart and fed in phase. This will produce a bidirectional radiation pattern with almost an S unit of gain, compared to a dipole, broadside to the antenna. Seeing this antenna is fed at the top of the vertical element the current portion of the antenna is high in the air where it really counts. The antenna is a direct match to a 50 ohm system so there is no need for a matching network.

half square HF 20 meters Antenna

Very  easy to install and tune.

Hard-to-beat combination of DX punch and simplicity.

These antennas are hand made and 100% tested on bench equipment and in the field.

Antennas are tested SWR LOWER THEN 1.5 TO 1 .

Power handeling 1.5 Kw ssb at 50 ohms

7 Strand 1.5 mm black jacket wire

Antenna has waterproof juction box

Heavy duty Marine Stainless fittings used

plastic end insulators

connecton is SO239