Thanks.
Last night, I got lazy and just popped the gps on top of the HU and stuffed it all in the dash and I'm not getting any signal (actually, the status screen says OK, but it looks like the satellite icons are all dimmed. I assume this means no signal). This is before I read your reply.
I think I will run the gps antenna into the engine compartment and mount on the part of the frame (top of firewall, under the plastic cowling where the wiper is. I have my XM antenna there and have never had any reception problems. Only thin plastic between antenna and sky.
Couple more quick