Antenna noise on 1994 Mercedes c220

[ericnguyen]

Dear friends:

My 1994 Mercedes c220 has started having some rattling noise
around (under) the radio antenna located on the driver side of the trunk. The noise only comes up and lasts for about 10 seconds whenever:
1) Ignition ON
2) Radio ON
3) Ignition OFF (shutting down the car).

Did anyone have a similar symptom and what was your solution?

I think Mercedes cars love to make weird noises occasionally (such as fuel pump noise at startup, antenna noise etc...)

I owned some very old Japanese cars (Honda Accord, Toyota Corolla) and none of them had intermittent and unpredictable problems like my current Mercedes car.

Thank you very much in advance.

Eric