Antenna Length Calculator

A half-wave dipole is the most common antenna type, consisting of two conductive elements each approximately one-quarter wavelength long. The total length is approximately half the wavelength of the desired frequency. It provides about 2.15 dBi gain.

The practical antenna length is typically 2-5% shorter than the theoretical length due to the 'end effect'. The finite thickness of the wire and capacitance at the ends effectively make the antenna electrically longer than its physical length. A factor of 0.95 is commonly used.

A half-wave dipole is the most versatile choice for general use. Quarter-wave antennas require a ground plane and are common in mobile applications. 5/8 wave antennas provide more gain for VHF/UHF verticals. Full-wave loop antennas are used for directional reception.