If the ignition key is in the position «ON» or «ACC», you can use the radio. However, if the engine is not running, the ignition key must be in the «ACC».
Set the antenna length for best reception. Generally, in large cities, a short antenna works better than a fully extended one, which is better suited for remote reception.
The FM transmission range is about 40 km. If you are moving away from the transmitting station, you will need to fine-tune your radio and turn up the volume when the signal is weak. Tall buildings or hills interfere with FM reception. All this is normal and does not indicate a malfunction of your radio itself.