Antenna Calculator

Calculate element lengths for common ham radio antennas.

Frequency (MHz)

HF band: 40m

Antenna Type

Half-Wave Dipole (FT: 468 / freq)

Each leg is half the total length.

Feet

65.23 ft

Meters

19.89 m

Full-wave reference: 41.812 m

Formulas: Dipole = 468/freq (ft), Vertical = 234/freq (ft), J-Pole = 131/freq (ft)