Check the antenna mast. Ensure the antenna mast is fully extended and not damaged or bent. If it's damaged, it will need to be replaced.
Check the antenna cable. Ensure the antenna cable is properly connected to the radio and that it is not damaged. If it is damaged, it will need to be replaced.
Check the radio settings. Make sure the radio is turned on and that the antenna is selected as the input source.
If the above steps do not resolve the issue, there may be a problem with the radio itself or the antenna amplifier. In this case, you will need to take the car to a qualified mechanic to have the issue diagnosed and repaired.
Here are some additional tips for troubleshooting the antenna on your 1993 Mercedes Benz 300se:
Make sure that the car is not parked in a location where there is a lot of interference, such as near power lines or tall buildings.
Try turning the radio on and off several times. This may help to reset the radio and antenna.
If you have a multimeter, you can check the voltage at the antenna amplifier. It should be between 12 and 14 volts. If it is not, there may be a problem with the amplifier or the wiring.
