Thanks for the great info. I'll check out my p/n to see how old my receiver is. As far as the antennas are concerned (for Tom G.) the Terk antenna is definitely smaller than the older BMW antenna, but is it smaller than the latest BMW antenna? Also on your website it says to mount the antenna to the roof which is magnetic and my understanding is that the large metal roof essentially boosts the signal. However, mounting in the spoiler it would not have have this large roof area so wouldn't the signal be much worse?