Quarter Wave Ground Plane Antenna Calculator Frequency MHz Velocity Factor (see text*) vf Give me the results in… mm (MilliMetres) cm (Centimetres) m (Metres) in (Inches) ft (Feet) A. Vertical Monopole Radiating Element (λ*0.25)*vf B. Radials (λ*0.28)*vf Actual wavelength Ahh, the good old quarter wave ground plane! This calculator can be used to design a … Continue reading 1/4 Wave Ground Plane Antenna Calculator