Time to work on the power antenna. Unlike the Reatta that usually has the cable that drives the mast break, the Mercedes is prone to breaking a little tab (see red arrow) on one of the gears the runs the mast up and down. The cable going to the mast on a Mercedes has teeth on it that is pushed up and down by the teeth on the gear. Luckily the cure for the problem is just using epoxy glue to put the tab back on the gear.
The gear on the left with the big spring goes on top of the gear with the red arrow. Together they act as spring loaded clutch to prevent damage to the cable when the mast abruptly reaches the end of it's travel. The antenna motor is shut off by a current sensing module attached to the antenna, much like what is done to shut off the Reatta headlight motors when they reach the end of their travel.