I have use a wilson sleek for my tow vehicle - it provides enough boost that at my house I go from 1 bar to 3-4. This device requires you place your phone in a cradle so you will need a bluetooth headset to use it.
I also added a wilson rv antenna to the coach which has a built in ground plane & gives me a 3db boost over the stock Sleek antenna.
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1983 Newell Coach
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