An omnidirectional antenna is an antenna that sends or receives signals in all directions equally. It is also called a "non-directional" antenna since it does not favor any particular direction.
The signal pattern for omnidirectional antennas is circular. That is because it works with signals from any direction, thus giving it the ability to work uniformly in a perpendicular plane.
Omnidirectional Antenna vs. Bidirectional Antenna
Omnidirectional antennas differ from bidirectional antennas, which send or receive signals from two directions.
Omnidirectional Antenna vs. Unidirectional Antenna
Omnidirectional antennas also differ from unidirectional antennas, which only work with signals coming from one direction.
Omnidirectional antennas have the upper hand over the other antennas in that they can deal with signals from any direction.
Signal strength is uniform with omnidirectional antennas, while bidirectional and unidirectional ones have the ability to strengthen signals while eliminating unwanted ones.
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