Halo antenna

A halo antenna, or halo, is a horizontally polarized, omnidirectional ​1⁄2 wavelength dipole antenna, which has been bent into a loop with a small break on the side of the loop directly opposite the feed point. The dipole ends are close but do not meet, and may have an air capacitor between them as needed to establish resonance. A halo antenna, or halo, is a horizontally polarized, omnidirectional ​1⁄2 wavelength dipole antenna, which has been bent into a loop with a small break on the side of the loop directly opposite the feed point. The dipole ends are close but do not meet, and may have an air capacitor between them as needed to establish resonance.