Antenna / Wavelength
λ, dipole, monopole, 5/8 vertical, 468/f rule
About this tool
Wavelength λ = c / f and practical antenna lengths after applying a velocity factor k.
Output
- Free-space λ and physical λ·k.
- ½λ dipole, ¼λ monopole, ⅝λ vertical, full-wave loop.
- Classic empirical rule
L_dipole(ft) ≈ 468 / f(MHz).
Typical k: thin wire dipole ≈ 0.95, RG-58 coax ≈ 0.66, foam coax ≈ 0.83.