Interesting Antenna Design

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jonwienke

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Don't.

Shortwave antennas need to be extremely wideband. The range of frequencies varies by about a factor of 10 (1000%) from the lowest (2.3MHz) to highest (26MHz). Variable tuning is required, but such designs are far less efficient than a typical 1/4-wave antenna.

700MHz band has a less than 5% difference between min and max frequencies. A simple 1/4-wave whip can handle that bandwidth with reasonably low SWR, and there is no need to use variable tuning elements in the antenna design.
 
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