How to Calculate VHF Radio Antenna Length
- 1). Decide which frequency you want the antenna to receive. Express the frequency in megahertz (MHz).
- 2). Multiply this frequency by 1,000,000 to convert its units to hertz (Hz).
- 3). Divide 299,792,458 meters/second (m/s, the speed of light) by the frequency in hertz (Hz). This will give you the signal's wavelength in meters.
- 4). Divide this wavelength by 2. This result represents the combined length in meters of the entire dipole antenna.
- 5). Divide by 2. This is the length that each of arm of the antenna must be in order to properly receive the signal.