I tried this system with various types and arrangements of antennas but could not get reliable cell phone service. Whenever I turned on my phone the amplifier indicated the error mode of oscillation caused by having the indoor and outdoor antennas too close together, even when I had them 50 - 60 feet apart rather than the recommended 25 feet. I eventually bought a Wilson SOHO amplifier with Yagi PCS outdoor antenna and a directional indoor antenna and that works well.The only reason I gave this two stars rather than 1 is that my case my be more challenging than normal because I need to amplify a weak signal on my home network while there is a strong roaming signal already at my house.