Ok, I wanted it to work because I needed it.  I have an older home with thick plaster walls that effectively block my cell phone signal completely.  I use my cell as my only phone so I need it to work at all times.  I can get three bars if I step out on my front porch but as soon as I go inside and close the door- no bars.  So, I thought this would be perfect because it would grab the outside signal and bring it inside where I needed it.  Well I went through the trouble of hooking it all up- getting the two green lights and following all the conditions detailed in the instructions.  It did NOTHING- had no effect whatsoever-  I began to feel like I got scammed.  I am returning it.  The outdoor antenna box feels like an empty piece of plastic- I wanted to look inside but probably would not be able to return it if I did.  I've read the reviews about there needing to be a signal to amplify- that's why I checked the signal outside.  Maybe it does work for some people just not for me.