| i've got an 05 c230 and have the same problem. i took mine to mercedes and paid to have it looked at..there is a strip of plastic right behind the backside of the headliner which like u said is called the antenna amplifier. mine is actually damaged and the cost of the part is 450 for a piece of plastic with sensors in it. along with that beautiful price is the quote of 900$ for labor...so i hope u find luck with it being only the fuse | 
