Laser 558

The offshore radio Laser 558 sent from the transmit ship MV Communicator, anchored lay in the proximity of the broadcasting ship Ross Revenge Radio Caroline 's for the English coast. Test transmissions started on 19 January 1984. It was with broadcasts ended on april 20, 1987. Used frequencies (wavelengths) were 558 kHz (538 m) and 576 kHz (521 m) medium wave.

A patrol boat came between the Communicator and Ross Revenge are to spy on all movements of supplies or to visit supporters and photograph. This boat "Dioptric Surveyor" served as a spy ship commissioned by the DTI (Department Of Trade and Industry). This action called Eurosiege 85 was intended to all employees, such as suppliers, sponsors, disk jockeys and thus deter, to silence the zeezenders final.