AU Ford Sat nav antenna location?

[LTDmonger]

Hi All

I'm retro fitting my series 1 AU LTD with the series 2 sat nav option that was standard on the LTD and optional on other models.
Does anyone know where the factory mounting point for the antenna is?
I'm thinking the rear parcel shelf...anyone have a series 2 factory installed who could post a pic or let me know the location...I want to try to keep the retro-fit as close to series 2 standard spec as possible.
The schematics don't seem to help