I have a 98 CLK with the radio antenna embedded in the rear windshield. My reception of distant stations is fine, but I have problems with the stereo decoding on FM. It seems to drift in and out of stereo when driving the car. The dealer checked the antenna and the connections are OK. He swapped out the radio control unit for another one but the difference was marginal, so he put the original one back in. At this point, he says the problem is probably the design of the rear window antenna and there is nothing else he can do.

Has anyone else had problems with this window antenna design? Has anyone replaced it with a conventional radio antenna or perhaps the rubber one that comes with the Cabrio? How about a signal booster? I'd would be happy to hear your experiences/suggestions.