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What is the correct resistance (10 Ohm) with respect to the size of the square holding the Antenna wires. Is 20'' the square diagonal, side-length, or total length?

If you are a long distance away from your transmitter, say in Europe, then you should definitely build the large antenna.

The antenna resistance will be between 4 and 12 ohms -- it really doesn't matter to be exactly a certain resistance, just as long as it's not a short circuit or the wire is broken.

The size is about 3' to 5' per arm (1~1.5 meters). The measurements are made at the arms of the antenna frame... or to say it another way -- the "diameter" is two arms so that makes it between 6 and 10 feet. The wire side of the antenna is calculated by the hypotenuse of the triangle.

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