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If you made a quarter-wavelength vertical antenna for 21.125 MHz, approximately how long would it be?
3.36 metres (11.0 ft)
L (m) ≈ 71.5 / 21.125 MHz ≈ 3.38 m. L (ft) ≈ 234 / 21.125 MHz ≈ 11.08 ft. (Closest answer is 3.36m / 11.0 ft).
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