This tool calculates the physical dimensions of a 20 meter (m) dipole antenna.

20 m refers to the wavelength of the transmitted and/or received signal.

Using the calculator below at 20 meters,

- the dipole length (L) is
**31.2 feet** - the length of each element of the dipole (
**l**) is half of that at**15.6 feet**

**Formula**

The total length (L) of the dipole antenna is calculated as:

**L = 468 / f **

where **f** is the frequency in MHz.

f is calculated from the wavelength. For 20 m the frequency is **15 MHz**.

The length of each arm of the dipole

**l = L/2**