My apartment in the center of a major city is a mysterious dead zone for cell phones - all but one major carriers' signals fail to reach my living room. I can however get 2-3 bars at the windows and balcony. After doing some research I found that this is exactly the situation the Wi-Ex product is supposed to address - and it does so almost perfectly. After spending about 30 minutes mounting and connecting the parts, I am able to get 4 bars throughout the apartment! There is no noticeable difference in call quality compared to what I can get outside the apt.