I got this unit for our office because cell phone reception is terrible there and I got moved to the middle of the building. When I first set it up, I had the antenna over by a window. I stretched the 50' cord over near my desk. The signal didn't improve much if any. So I purchased a 100' cable and ran the antenna out into our breezeway area, still inside the building. That made all the difference in the world. I was now able to get between 4-5 bars everywhere in our area, whereas before, I got 0-1. When we put the cable in the ceiling, (I had it on the floor for the test), we lost some reception, I assume due to the electrical in the ceiling, but it still works well. I believe a better shielded cable would help. The one I purchased was just a standard coax cable.