File:Figure D-11 Long-wire antenna (FM 7-93 1995).gif

Summary

Drawing of a "<a href="https://en.wikipedia.org/wiki/long_wire_antenna" class="extiw" title="en:long wire antenna">long wire antenna</a>", a directional radio <a href="https://en.wikipedia.org/wiki/antenna_(radio)" class="extiw" title="en:antenna (radio)">antenna</a> used for communication in the <a href="https://en.wikipedia.org/wiki/high_frequency" class="extiw" title="en:high frequency">high frequency</a> (shortwave) bands, from a U.S. Army field manual. This is actually a type of antenna called a <a href="https://en.wikipedia.org/wiki/Beverage_antenna" class="extiw" title="en:Beverage antenna">Beverage antenna</a>. It consists of a random length of horizontal wire from 1-2 wavelengths long, terminated at one end by a resistor equal to the characteristic impedance of the antenna, about 600 ohms, with the receiver connected to the other end. The resistor is attached to a second parallel wire below the first, which functions as a <a href="https://en.wikipedia.org/wiki/counterpoise_(ground_system)" class="extiw" title="en:counterpoise (ground system)">counterpoise</a>, an artificial "ground". It is a nonresonant antenna, and so is broadband, sensitive to a wide band of radio frequencies. The <a href="https://en.wikipedia.org/wiki/main_lobe" class="extiw" title="en:main lobe">main lobe</a>, its direction of greatest sensitivity, is to the right, parallel to the wire, off the end that has the resistor.

Licensing

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