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I think it depends what chipset is in your Sat Nav. Ive got the thermal windscreen in my car and dont have a problem with getting a signal with my Tom Tom one V2.
I think its got the more powerful Sirfstar III chip in or something which helps get the signal through the thermal windscreen.
Like tigs said, unless you want to get a new sat nav, get an aerial for it and mount it either side of the rear view mirror (in the black bits).
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo