Join Date: Jul 2005
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Based on the age of the unit, I'm guessing that it doesn't have one of the more sensitive receivers that you find in the later sat-nav systems. The athermic coating on the windscreen will give you problems, but there are solutions without putting the antenna on the outside of the car.
The simplest solution is to use double-sided foam tape to stick the antenna to the windscreen in the dotted area around the rear view mirror. This section of the glass doesn't have the athermic coating, and so you should get a good signal.
This is what I did with the remote antenna for my TomTom GO 700 (also older technology that struggles with coated windscreens) and it worked fine.
Currently in Horatio's garage:
2010 Laguna III Initiale.