Omnidirectional Antenna

Horizontally Polarized Omnidirectional Antennas:

 * Halo The simplest form - a dipole bent into a circular shape.


 * Big Wheel More elaborate. Mainly used on VHF and UHF.

Circularly Polarized Omnidirectional Antennas:

 * Turnstile Often used for satellite communications.

Verticallly Polarized Omnidirectional Antennas:
All vertical antennas with a single element are omnidirectional radiators.