David, i got the cable and started playing around the the programming and finally got an opportunity to test them out. i set up one of the channels as gmrs talk around/simplex and put one in my car and one it the wife's car. we ended up getting some pretty good separation between on on parallel streets that separated farther away from each as we traveled with lots of obstructions between us..there was only a brief moment that we lost contact. but as i turned onto a street that would intersect the one she was on we again had radio contact. i followed her the rest of the way home keeping my distance we always had a very clear signal. not having any previous experience at all. this has been a great great resource, but i feel like i have so much more to learn. These are going to work perfect for what i was wanting them for, i can hardly wait to try them out in the mountains. Im also studying for my tech license. i can see myself with a dual band gps/aprs radio in the near future. in the mean time these radios will teach me plenty..thanks William