Omnidirectional antenna
An omnidirectional antenna is an antenna system which radiates maximum power uniformly in all directions.
The perfectly omnidirectional antenna is the isotropic antenna,
a theoretical construct derived from actual antenna
radiation patterns
and used as a reference for specifying antenna gain
and radio system effective radiated power.
Practical antennas approach omnidirectionality by providing
uniform radiation or response only in one reference plane,
usually the horizontal one parallel to the earth's surface.
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