People used to have antennas that stuck up from the car. Then they were made electric, and then the manufacturers designed 'sleeker' antennas which are built in with the rear heated screens. Some manufacturers use 'shark-fin' antennas on the roof.
Much like with the old type, if the antenna fails it needs replacing.
However, you may well find that a Merc dealer is the most expensive way of getting the job done. I'd suggest you find a good independent merc specialist.
Oh, and a 'design fault' that lasts 8 years before a problem isn't a design fault.
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