The most economical antenna for omnidirectional applications.  Simple to install.  Must have a conductive ground plane.

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  General Purpose Broadband Stub Antenna AO1712
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  General Purpose Broadcast Omnidirectional AO2012
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  Quarter-Wave Monopole Antenna AO2040ST
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  Omni-Vertical Dipoles AODV Series
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  Microwave Landing System AO5053-B
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  UHF Monopole Antennas AO(***)MON(TNC)