Omnidirectional antennas are best suited for applications in which a mobile client can be moving or in any position related to the horizontal plane.

Gains depend on the vertical lobe angle, being the lowest when the angle es +90º -90º and the highest when the lobe has a few degrees vertical, a 2 dBi to 15 dBi range is supplied by LanPro
Omnidirectional Antennas
  Omnidirectional UHF  
375 to 512 MHz 5 dBi Heavy Duty OMNI type Antennas.
  Omnidirectional 5.8 GHz  
Omni Antennas 5.8 GHz Band
  Omnidirectional 2.4 GHz  
Omni Antennas 2.4 GHz Band
  Indoor Omnidirectional  
InWave Series Omni Antennas
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