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Rhombic Antennas

December 28th Fact-of-the-Day

Rhombic antennas used to be very popular shortwave broadcast antennas, because they have broad frequency response, rather high gain, and they are relatively inexpensive to construct and maintain. The primary reasons they have not been used more by amateurs are that they require large plots of land and they cannot be easily rotated. However, there is another important disadvantage that is not as well known to many amateurs. The vertical and horizontal radiation patterns are dependant upon each other. The sharper the horizontal beam width, the lower the vertical beam angle, which makes it impossible to obtain narrow-beam, high-angle radiation. Because of that, rhombic antennas are best suited for DX and are not well suited for short-range applications. ©2004 Martek International All rights reserved.


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