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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 electromagneticequivalent, the monopole could beconsidered one of the best antennas for LMRapplications.

An antenna array (or array antenna) is, much like it sounds, several elements interconnected and arranged in a regular structure to form an individual antenna. The purpose of an array is to produce radiation patterns that have certain desirable characteristics that a single element would not. A stacked dipole array, as shown in

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  Array, Dipoles, Dipole array

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