In my 07 expy there's a pod behind the review mirror. I don't have navigation or satellite radio.

I was thinking the nav antenna or the satellite antenna was in there.

Does anyone know what's in there? I am going to add a sirius satellite reciever (external) and it would be nice to tap into that for it's antenna.

 

That is Compass

The reciever if equipped looks like a little black nub and is mounted ontop of the cab(roof)