It looks like the antenna can cause the ACC and braking guard to be unavailable. Some sort of fail safe if a module goes down.
Maybe it's still able to receive enough satellites to give an accurate position?
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Cars...
'93 Audi Coupe 2.0 Alpine White (sold)
'99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold)
'00 Audi S8 Agate Grey (Sold  )
'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ)
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