Dipole Antenna Length Calculator
Half-wave and quarter-wave dipole lengths for a frequency, including a velocity (end-effect) factor, plus gain and aperture.
How to use the Dipole Antenna Length Calculator
- Enter or select: Frequency f, Shortening factor.
- The results (Free-space wavelength, Half-wave dipole total length, Each leg, Quarter-wave monopole, Half-wave dipole length, Directivity, Effective aperture, Radiation resistance) are calculated instantly as you type.
- Use “Copy link” to share the calculation with the same input values.
Formula
- λ = c/f
- L = 0.5·λ·k (k ≈ 0.95)
- D = 1.64 (2.15 dBi)
- A_e = D·λ²/(4π)