the system requires something plugged to headphone/audio/video-socket to be used as FM-antenna. Even just plain mono 3.5mm plug without any wires soldered to it works, if you then touch the connector so yourself become the antenna.

I have for _years_ suggested Nokia would make a "touch-FM-antenna" and write the FM-radio applications and drivers so it would not require headphones to be connected. In emergencies one could listen strong FM-stations (in mono) just by using moist wooden stick or something inside the 3.5mm socket.