I'm using a motorola mirror mount mushroom looking thing. I don't know its model, but its about 12 inches tall and it never drops out. I used to get lots of drop zones in the Appalachians, and now I get no drops.
I put mine pretty far out on the mirror to give it the best line of sight with the sky as possible.
FYI I have a glass mount powered TV antenna for the back and it works well while traveling down the road.
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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