Car radios autoradio [de] can pick up frequencies only where the signal is strong. Some channels have reach only in certain areas and will fade out when you move away from that area. In the UK, if you are within the city limits, the signals are strong for some channels and not so strong when you leave the city. If your car radio cannot receive weak signals, you can always try to adjust the antenna to see if it can pick up something. If your radio is old or does not have the latest features, you can always buy the easy to connect transmitters that are available in the market. Just buy them, plug them in your car and enjoy the numerous FM stations.