They are only useful in areas without FM stations. I had one and threw it away, because every 5 km there would be a station on the same frequency interfering so

They are only useful in areas without FM stations. I had one and threw it away, because every 5 km there would be a station on the same frequency interfering so the copilot had to change the frequency... useless. What a "luck" that Switzerland is shutting down FM. Ah, and you can't do phone calls with it either.