I bought this for my parents who live out in the middle of nowhere in Virginia. I bought 50 feet of extension cable and put the exterior antenna up on their roof. As soon as I did that, both of my parents could use their Alltel phones in the house. Previously, they couldn't get a signal without driving half a mile away.My Verizon aircard also worked using this extender, though the signal was still weak. My AT&T; iPhone still had no reception, but I guess you can't have everything.I didn't see how this thing could possibly work, but it does. Just take the time to install it the way that the instructions tell you to. The more separation you can put between the base and the exterior antenna, the better reception you will get.