Ground Plane antenna calculator

About

This calculator gives the length of every element of a Ground Plane antenna: the vertical radiator and the radials.

The radials slope down at 45° — that brings the feedpoint impedance close to 50 Ω

Operating frequency		MHz
Result
Wavelength (λ)		cm
Vertical radiator		cm
Radials		cm

Notes:

The wavelength is worked out from the standard formula.
The calculation assumes a quarter-wave configuration.

How to cite this calculator

UR3PKI. «Ground Plane antenna calculator». CyberDev.Space. https://cyberdev.space/en/radio/calculators/antennas/ground_plane (licence CC BY-NC-SA 4.0).

The licence lets you use this material freely, including in teaching materials, but only with attribution to the author and a link to the source.