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GPS antennas require a ground plane to operate correctly. This helps to reduce unwanted reflections of the GPS signal
caused by nearby objects, and usually the metal roof of a vehicle performs this function. However, if a test requires an
antenna to be placed either off the vehicle, or on a vehicle that does not have a metallic roof, a special ground plane
antenna must be used. This has an internal ground plane and can operate perfectly without the need for mounting on a
metal surface. Ground plane antennas are available from your VBOX distributor.
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