Halo antenna

A halo antenna, or halo, is a center-fed ⁠ 1 /2⁠ wavelength dipole antenna, which has been bent into a circle, with a break directly opposite the feed point. The dipole's ends are close, but do not touch, and the ends on either side of the gap may be flared out to form a larger air gap capacitor, whose spacing is used to fine-adjust the antenna's resonant frequency. Most often halos are mounted horizontally, resulting in the antenna's radiation being horizontally polarized and very nearly omnidirectional.

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