I hope that you are still under warrenty! You have either a bad ground, a bad antenna module, or both. I had the same problem on my 99 ML320. Couldn't get a clean signal from a 50k watt station a few miles away. The dealer took care of it. There's a remote chance that you have a broken heater line on the rear window. Take a look.<br> <br> The rear defogger doubles as the AM/FM antenna, not the best choice for a liftgate. You'll notice that most of the newer vans and SUVs with hidden antennas put them on the rear quarter glass. I don't know of any type of aftermarket product.
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