I myself would be fearful of cutting a whole on the roof. Maybe try this though.
Use a splitter on the TV antenna jack. Then use a 75 Ohm to 50 Ohm connector on one side of the splitter for the radio and of course the other side is for the TV. Only down side I can see is the amplifier. I 'm sure it doesn't have the bandwidth to amplify radio signals but it might have given you enough gain to get better radio reception.
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07 Gulfstream Mako 28FRBH
06 Silverado 2500HD, Duramax/Allison
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