This booster works really great on the rare occasions it actually works at all. It has a red light which is supposed to indicate that the antenna is too close to the box. I have the antenna as far away from the box as the wire permits, and when I turn the box on, the light shows green and the device works great... for about 15 minutes or so. Then the red light comes on for no apparent reason, and the device has to be unplugged and plugged in again to make it work again. So, this makes it pretty useless, because unless I just happened to plug the device in minutes before someone calls me, it won't be working.