I bought this for my camper, which sits down in a hollow.  Normal reception on the phone is basically half a bar, so I was obviously concerned that there wouldn't be enough signal to boost.  I put the antenna on a piece of pvc and mounted that on the wooden marker post for the camping spot.  I can raise or lower it and change the facing direction if I want.  I put it up about 8 feet off the ground.  In the trailer the signal went to 2 to 3 bars.  Not being able to make a phone call before, has turned into being able to make a phone call now and with decent quality.  Data reliability also improved.  Range for me is maybe 10-12 feet from the transmitter, which covers the living area of the trailer.  The signal is broadcast in a cone, so you have to play with the transmitter a bit to get the best coverage.  The best part, my phones battery would drain in about six hours, hunting for a signal before I got this kit, now it goes down at a closer to normal rate.  For my situation, it was worth the price knowing that I can now at least call 911, which I likely couldn't before.