This stubby little GSM antenna performs exceptionally well. It was specially designed to work with the aluminum case of an ADCON RTU as a backplane. Most manufacturers of GRPS loggers include off-the-shelf antennas from the automobile industry - which is rather inefficient, as these antennas usually requiure to be mounted on a large metal sheet (= a car roof) to deliver good performance.
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This antenna is designed and built in Europe. It comes with a TNC connector with an internal seal to provide good environmental protection.