AU3 GPS Aerial position?

[zeuss000]

Howdy Folks, I have an AU Series 3 Fairmont Ghia, the navigation system that it has was probably a factory install (i think) the monitor is where the ash tray would normally be and the DVD unit is under the passenger seat.
What i am trying to figure out is where they have stashed the aerial, from what i can work out it is a smallish box probably a couple of inches square, i can find the wire that plugs into the back of the DVD player and the wire goes under the carpet and without ripping out the carpets i have no idea where it is hidden, i can't see it in the boot anywhere or under the bonnet, maybe it is under one of the guards maybe behind the plastic shields?
It's got me beat.
Any suggestions as to where it might be? i am hoping someone here has the same setup and can enlighten me.
Cheers
Ed