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Mine I just coiled the coax 18" below the SO-239 made 5 turns at 4.25" ID. Made a real difference bleeding over anything and everything. SWR's did not change a bit I basically can go from 18-30Mhz with 1.7:-1.8:1 and at 26-28Mhz are under 1.5:1 acording to the Mfj analyzer.