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Measuring device: http://www.amazon.de/gp/product/B00CJ... Calculate frame antenna http://www.b-kainka.de/bastel95.htm VLF = very low frequency frame antenna, ideal for 88 khz - 380 khz. But also goes much lower to under 20 khz. 39 turns of copper enameled wire 0.6mm = 109 meters. 3 variable capacitors with a total of 2300 pf. Dimensions: 70 x 70 x 30 cm