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New Army Loop antenna. New Army Loop antenna with a variable capacitor and a ferrite ring. When I have time, I will build and test the loop a little better. Have fun and 73 Warning! I accept no liability whatsoever if these antennas are copied onto devices or people (e.g. high voltages can occur on the variable capacitor even at low power levels). Only licensed radio amateurs are allowed to transmit on the corresponding approved bands.