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Approximately how long is each side of a cubical quad antenna driven element for 21.4 MHz?
3.54 metres (11.7 feet)
The total perimeter of a quad loop is approx one wavelength. λ(m) = 300 / 21.4 ≈ 14.0 m. Each side ≈ λ/4 = 14.0 / 4 ≈ 3.5 m. Refined formula: Side(ft) ≈ 251 / f(MHz) = 251 / 21.4 ≈ 11.7 ft. (3.57m).
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