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monitorboy

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does a mobile mag mount scanner antenna need a foil bottom to use the vehicles roof as ground plane and do i have to some how have the foil contact the metal base of the antenna. thank you
 

kb5udf

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No

Most of the mag mounts I've used have materials covering the magnet which are insulators (rubber and/or plastic). But if you have one with a metal bottom there's no harm in trying some protective cover (for your vehicle over it), just check the signal levels and make sure it still sufficiently sticks to the car.
 
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