Get a through the glass CB antenna. Have one on my F350 on the rear window. I have a CB in the truck, A Uniden and I use it to monitor truckers filthy mouths and talk to my wife (she has one in her Burb as well), through the glass antenna as well. We also have FM transceivers in the tractors and a base station at the farm for communication. They have some really dandy CB's out now with SSB and shortwave built in.
My best and most expensive buy was a SAT phone. They work anywhere and no dropped calls but you pay by the half minute and air time isn't cheap. I take it on out west hunts where there is limited cell service and the one I have has a built in emergency beacon too.