Not sure about the car version as I haven't installed it yet, I'm having someone else install it next week cause if I do it I'll have wires hanging everywhere.
As for the home hookup, I get perfect reception. In California the satellite is to the SE, and the antenna cord is long enough that you can wire it to the other side of a mid-sized room and have it pointing out of the window. They also have something like 1000 land-based transmitters relaying the signals everywhere, and from what I hear California is pretty wired up in that regard.
The only thing I suggest is getting a shielded stereo mini to dual RCA cable, the one provided with the home kit is a piece of crap picks up interference like mad. With a $12 shielded cable I have my whole setup sitting right next to my computer monitor with no interference whatsoever.