Enter diameter in mm (e.g., 2.0) or AWG (e.g., 12). Applies shortening factor.
The classic formula for a half‑wave dipole is L(ft) = 468 / f(MHz). This includes a shortening factor (~5%) to account for end effects. This calculator supports real‑time conversions and wire gauge correction.
The theoretical half‑wavelength is 492/f, but practical antennas require a shortening factor (≈5%) due to end capacitance, yielding 468/f.
A vertical antenna with radials. Its length is L(ft) = 234 / f(MHz).
Yes, thicker conductors require slightly less length. This calculator can apply a correction factor.