| Omnidirectional Antenna |
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The only 3 dimensional 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. Common omnidirectional antennas are the Whip Antenna , a vertically oriented Dipole Antenna , the Discone Antenna , and the horizontal Loop Antenna . |