# Amateur ground plane calculator

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## Ground Plane Antenna Calculator - Resource Detail - The lamusedesgones.com

Radio waves behave very similar to the photons in light waves. The wavelength calculators used to calculate the antenna element dimensions will therefore use the speed of light meters per second in a vacuum as constant. Note: when using coax for antenna elements it is advised you lookup and apply the velocity factor because RF slows down in coax and this will impact the effective measurements for antenna elements. An omni-directional end-fed half-wave antenna with a quarter-wave transmission line matching stub.

### RF Antenna calculators for various antenna types

Ahh, the good old quarter wave ground plane! This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. There are usually four radials, three being a minimum, but you could use up to six. You could cut a little on the large side and trim the antenna for best match at your desired frequency if you have the equipment. For VHF and below, as the elements get bigger, some more structured design is needed.
The standard ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. Each radial is evenly spaced 90 degrees or so from each other around the vertical element. The vertical length is feet. The 4 radials are each feet. The halfwave vertical antenna consists of a vertical radiator which is fed from the bottom of the antenna.

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