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Antennas

Ground Plane calculator

Quarter-wave ground plane antenna dimensions. Radial droop angle affects impedance match.

Ground Plane calculator

Frequency (MHz)

Radial droop angle (degrees) 0 = horizontal, 45 = ~50 ohm match, 90 = vertical

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4 radials, sloped for 50Ω

Vertical element --

Each radial --

Approx impedance --

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