After FINALLY finding the darn tool to get the Bose radio out, I could not spot an AM antenna adjustment.
Perhaps I am missing something.

When I first got the car the AM was real bad. I found a loose antenna wire connection behind headliner just back of the top of the left rear seat window. There was a connection block in there and the antenna wire coming from the back was lose. I got it as tight as I could (I could just barley get a finger on it with out taking the entire headliner off) and the AM has worked fine ever since. The Bose does not have the greatest sounding AM section I ever heard,
But it does pull the stations in ok. I work at an AM station so I am one of the few who care about getting the AM to work.

It is bafflement to me why MB puts such a mediocre radio in such a fine car.

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1999 E300 TurboDiesel
2007 Ford Explorer limited
1981 John Deere 650 Diesel tractor