I plan on getting a CB with a mag mount antenna for road trips, but every once in a while I see myself in situations where it could be useful to talk to a truck near me when I wasn't planning on it (e.g. a traffic jam). I was planning on keeping a handheld unit under the seat or something and was just wondering, when I do use it what kind of range I will get. Also, would having the windows down help? I assume I could talk to a truck RIGHT next to me, but what about 1/4, 1/2, 1 mile up the road? Will I be able to transmit as far as I can receive and vice versa?