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A quarter-wave stub, for use at 15 MHz, is made from a coaxial cable having a velocity factor of 0.8. Its physical length will be:
4 m (13.1 ft)
Free space wavelength λ = c/f = (300 × 10^6)/(15 × 10^6) = 20 m. Electrical λ/4 = 20m / 4 = 5 m. Physical length = Electrical length × VF = 5 m × 0.8 = 4 m. (13.1 feet ≈ 3.99 m).
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