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

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 20m the frequency is 15 MHz.

The length of each arm of the dipole

**l = L/2**