I just set one up for a guy in an office building. I was fearing that I would have to put the antenna in a window sill. The room it is in, is in the middle of the building, (no windows). I had to set it up in there because that's where the phone system is, and I was tying the XM radio into that. The nearest window was in the next room, and there was a drywall wall, even above the ceiling tiles dividing it. Just for grins I connected the antenna and was suprised to see that it got 2 bars! So I poped open one of the ceiling tiles and set the antenna up there, and got three bars! Keep in mind that there was still drywall, wood trusses, plywood, tar paper and shingles between the satellite and antenna.
The receiver was a skyfi 2 and it came with the home kit.