My 2001 S3 has an Alpine head unit ( came with the car 5 years ago) The radio reception has never been 100% but now im lucky if it will pick up and hold even the big stations. When i bought the car the arial mast was shot so i replaced it ... However Audi reckon there is only the Genuine one that will work right? Problem was that was about 5 x the cost of any other... So i went with a lexus item ( slightly stubby) but ive tried others and non are great. Is this common? has water got in the arial base? Is there anything i can do apart from ripping it off and starting again??