Sorry if this topic has been covered already, but I couldn't dig up anything that might confirm my suspicions. I just bought an 02 C240 and the radio works but it's not picking up a signal (it is the model with the flip down cassette player). The roof antenna is missing which I believe is the tele aid antenna), but I was unsure if that is the same antenna that the radio uses. I'm also curious if that same antenna works with the key fob, as I just changed the battery on the key fob and nothing happens (the auto door lock buttons inside the car do work)?

Does anyone have any suggestions on what I should check and/or replace to get both issues fixed?