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17 Figure 5. The vertical dipole and itselectromagnetic equivalent, the verticalmonopole5. ANTENNA TYPESA ntennas can be classified in several way is the frequency band of include physical structure andelectrical/electromagnetic design. Theantennas commonly used for LMR both atbase stations and mobile units representonly a very small portion of all the simple, nondirectional antennas arebasic dipoles or monopoles. More complex,directional antennas consist of arrays ofelements, such as dipoles, or use one activeand several passive elements, as in the antenna technologies are beingdeveloped that allow an antenna to rapidlychange its pattern in response to changes indirection of arrival of the received antennas and the supportingtechnology are called adaptive or smart antennas and may be used for the higher-frequency LMR bands in the and MonopolesThe vertical dipole or its electromag

frequency. Some antennas will work well only for the design frequency, and their performance will degrade as the operating frequency is separated from the design frequency. 5.7 Unusual Antennas There are many other antenna types. Most of these are beyond the scope of this report, but knowledge about some may be useful for LMR users.

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