It Works! I office at home and the one room that didn't receive cell signal was my office! Now, with the YX510 PCS/CEL signal booster I get a consistent 3 to 4 bars. Great product; not too difficult to install... just walk around with your cell phone and see where you get the strongest signal and that's where you want to mount the external antenna (inside, outside, attic, etc.) I mounted mine on the roof attached to a PVC vent pipe and ran weather-proof Coaxial cable to the booster unit and placed it at my office desk. I was a skeptic, especially after reading some of the reviews, but no more - it works!