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Found this loop antenna circuit: http://www.pm.keirle.com/Loop/loop.htm I used 2n2222 transistors and single pad perforated board which I had on hand. Works well with my degauss coil from a old color TV ` 50 turns, 3 feet/ 1 meter diameter. As the SPECTRACOM 8165 antenna supply is not very strong I mounted the preamp inside and use a 12V supply across c1.