I recently baught some radios for my son and I in the woods. now the distance that is advertised hardly ever works out but normally your out of site from one another but really not that far away so why you would need 20 miles im not real sure. I went with a 14 mile range and it seems to do me just fine.
http://www.12volt-travel.com/two-way...dios-c-30.html Check this place out they can always answer any quetions you may have. I always do the research through forums but I also call some different dealers before i purchase to make sure what im reading is the truth.