I bought this wireless extender because I was getting about 2-3 bars inside the house. I knew going in that I needed a good signal outside of the house so that it could be "pulled" inside. Therefore before I bought this I put my blackberry into "dB" signal mode so I can track the numbers as I walked the perimeter of the house. I got 5 bars (about -55 to 65 dB) at the south facing side here in the Oakland hills and decided that this would probably work.The instructions were pretty clear and installation was a breeze since the place where I wanted to mount the external antenna already had a RG6 coax left over from a previous dish TV install. I connected the other end to the coax that was terminated inside the house and it just so happened it was where the lowest signal was. After booting up, I looked at my phone and voila! 5 bars. I tried to make calls and what do you know? No cut-outs, drops or scratches. I asked people to call me with the same result. So far I am impressed and glad I purchased this thing. Btw: I have AT&T; but I bought the dual band for others who might visit our place.[UPDATE: 2/12/11]So far so good on this unit but just wanted to make note of the possibility of the coax cable corroding (doesn't affect product rating). Be aware that you need to use weatherproof (or rather "weather-resistant") coax connectors. The reason I say this is because my signal recently dropped to 3 bars and my phone calls were deteriorating. It took me a couple of hours but I traced it to a connector on the roof where there was a "splice". The copper core had corroded and the connection was lost to the transceiver/antenna. I guess the old coax install that the satellite guys put in wasn't that good...[UPDATE: 3/28/11]Here's a link to a product that can "weatherproof" your coax splices (I think it's available from 3rd party vendor and I've seen it at the orange store):Tyco #CPGI-569224-1K RG6 F Cable Splice Kit