It does what I expect it to do. My cell tower is about 30 miles away, barely usable without this booster. The indoor and outdoor antennas need to be separated as much as possible and the outdoor antenna needs to be as far from your phone as possible for any system like this to work best. Sometimes my phone needs to be "rebooted" to make the best connection, otherwise I get complaints that my signal is breaking up, as the phone doesn't fully connect to the booster if I walk into the bubble with the phone already on. Make sure to protect the amp with good quality surge suppressors on both the AC line and the outdoor antenna, lightning kills.