Half Square 20 Mtr Antenna

Half Square Antenna

Half Square antenna is a great wire antenna for the DX edge. No need for a tower, rotor, and beam to get rare DX or be competitive.

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 a 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 Antenna Radiation Pattern

Half Square Antenna Radiation Pattern

Shown in the above picture is a representation of the actual antenna wire placement and the radiation pattern.

Take note of the little circle on the top of the left vertical leg

The red line represents the horizontal radiation pattern and the blue line represents the vertical take off angle. .

Half Square 20 Mtr Antenna Test

Park K-0677 Successfully Activated Today with K2AA - Thank You 

Thanks to all that contacted me today. This park was successfully activated on both the 20 meters and 40 bands using the half square antenna. K-0677 Great Egg Harbor National Wild and Scenic River

Half Square Tim G5TM

Tim G5TM   The EFHW is a very adaptable antenna as we can configure it in so many ways. By doing this as a half square we can make the harmonically related bands perform really well for DX!

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DX Commander Video on the Half Square Antenna

Unlocking the Secrets of the Half Square Antenna: Understanding its Design and Functionality