Like many other users, we found that the unit was REALLY picky about the placement of BOTH the antenna and the repeater. We spent about three hours moving things around, with the indicators giving every possible status: not enough signal from tower, TOO MUCH signal from tower, antenna too close to receiver. HOWEVER, once we found positioning that the unit seemed to like, the performance boost was FANTASTIC! We actually ended up putting the antenna up in the drop-ceiling and the repeater on the floor on the other side of a cinder block wall. Go figure. There are four of us "On-Call" supporting a manufacturing plant so it's critical that we have good service. We had horrible coverage in our office in the middle of the plant, surrounded by four cinder block walls and a steel girder ceiling, but after getting the zBoost up and running I now have FIVE bars at my desk where I had one or even NONE before. Bottom line: if you're patient and creative enough to find locations that the equipment's happy with, you WILL get improved coverage.