GNSS antennas require a ground plane to operate correctly. This helps to reduce unwanted reflections of the GNSS
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.
https://en.racelogic.support//Product_Info/VBOX_Data_Loggers/VBOX_3i_Range/VBOX_3i_User_Guide_(All_Variants)/02_-
_VB3i_GNSS_Antenna_Placement
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