How we worked it out
Updated as you change the numbers.
- Dipole (ft) = 468 ÷ MHz; quarter-wave (ft) = 234 ÷ MHz. Free-space wavelength (m) = 299.79 ÷ MHz.
Method and assumptions
468 ÷ f is the traditional amateur radio formula for a dipole in feet, about 5% shorter than a free-space half wave. Height, nearby objects and wire insulation shift the resonance.
Questions
How long is a dipole for 14.2 MHz (20 meters)?
About 32.96 ft in total, 16.48 ft each side.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.