I am just thinking one day, and the thought came to me (and I am in no way knowledgeable of radio networks) do law enforcement use some kind of repeater in the police car to help amplify what is coming out of their handhelds. So if the handheld can only transmit 10 miles, the repeater in the car picks up the signal and then amplifies it at another freq. Is this what happens? Or do police have separate systems in their car?