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You can shorten a vertical antenna by using a loading coil. This online calculator tells you how the amout of inductance your loading coil will need to have. Distance from antenna base to the center of the coil in feet. (Enter "0" for a base loading coil.)
- Vertical Antenna Calculator
Use this online calculator to determine the length of a...
- Vertical Antenna Calculator
Loaded Quarter Wave Antenna Inductance Calculator. Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The original javascript was created by Jack Ponton and can be seen here.
Use this online calculator to determine the length of a quarter-wave antenna from the frequency. Both metric and English units of measurement are supported.
This page looks at vertical antennas that are shorter than 1/4 λ, for any particular frequency. Almost any vertical element can be use on any band, if a loading coil is included. The loading coil helps to make up for the lack of element length.
Quarter Wave Antenna Loading Coil Calculator. Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole.
The VK1SV LF/MF Short Vertical Antenna calculator. This calculator will calculate the radiation resistance of a vertical antenna which is very short compared to the wavelength. This is typically the case for all antennas used by amateurs on LF (137 kHz) and MF (475 kHz).
This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them.
