Depends which windscreen you have. Test with standalone SatNav like TomTom or the one in phone inside car. If it works then internal aerial will be fine.
I had heat reflecting windscreen in mine and SatNav was not working inside car. I have since changed windscreen to regular and it works fine.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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