I live in a low lying "dead zone" which made it virtually impossible to reliably communicate with anyone via cell phone - am I'm talking on the major networks like Verizon and AT&T. Since I have installed this system, I now get FOUR BARS in the room where I've placed the antenna and 2-3 bars throughout the rest of the house. Yes it's a bit of work to install - you need to mount the receiving antenna on the outside of your house and then string the cable either through your attic or basement - but it works incredibly well once you've got it in place. I work from home a lot and needed absolutely reliable cell phone coverage and this device delivers it!!!