Antennas
J Pole calculator
J-pole antenna dimensions by frequency. Radiator, stub, gap, and feed point measurements.
J Pole calculator
copper pipe ~0.95, aluminum ~0.96, twin-lead ~0.82
Total length (3/4 wave)
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Radiator (1/2 wave)
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Stub (1/4 wave)
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Gap
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Feed point from bottom
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Pipe spacing (center-to-center)
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