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Rhombic Antenna

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Basic rhombic antenna

Basic rhombic antenna

A rhombic antenna can be made of two obtuse-angle V antennas that are placed side by side, erected in a horizontal plane, and terminated so the antenna is nonresonant and unidirectional. The antenna is placed end to end and terminated by a noninductive resistor to produce a uni-directional pattern.

http://www.tpub.com/neets/book10/42o.htm

Rhombic Antenna, 30m-6m

Rhombic Antenna, 30m-6m

Rhombics are high gain directive wire antennas. A rhombic is shaped like a diamond, if you're looking down on it. I.e., there are 4 'legs', 2 end 'points', and 2 side 'corners'. This one was designed for 10 meters and 6 meters, but it's proven useful all the way down to 30 meters. This particular rhombic is 120' long, 70' on a leg, 25' high, and it's a "terminated" rhombic.

http://www.fullwave.com/fsj/rhom1.htm

Rhombic antenna at 20 meter

Rhombic antenna at 20 meter

This system is simple to build. Each support consists of a used 35 foot class 5 wooden pole with a 30 foot section of 2 inch steel pipe overlapping the top of the pole 4 feet. They are bolted together with two 5/8 inch through bolts. Welded to the top of the pipe is an eyebolt that has a loop of dacron rope that runs the length of the pole and pipe.

http://www.angelfire.com/tx5/wieser/rhombic.htm