Radio Atlantis was a Belgian-owned offshore pirate radio station, which operated in 1973 and 1974 from the coast of The Netherlands and Belgium. The station began broadcasting from the Radio Caroline ship MV Mi Amigo on 15 July 1973. The station was owned by Belgian businessman Adriaan van Landschoot who ran a chain of companies all named Carnaby:
Van Landschoot's complaints about the lack of radio advertising opportunities on Belgian public radio networks and the prohibition of establishing a commercial radio station made him decide to organize his own "Radio Veronica, alike" offshore radio station aimed at promoting his products. The station broadcast taped programmes aimed at Flemish and Dutch audiences. They were recorded in a studio at Oostburg, Netherlands.
In October 1973 the station's contract with Radio Caroline was terminated, following the collapse of the mast on Mi Amigo. The station acquired its own ship, naming it after van Landschoot's wife, the MS Jeanine (or Janiene - sources differ, and several other alternate spellings have been offered). Following three weeks of tests the station recommenced broadcasting on 30 December 1973. Both taped Flemish and mostly live English programmes were broadcast until the station was forced off the air by the Dutch Marine Offences Act. Radio Atlantis closed on the evening of 31 August 1974, the day before the act came into force. (Radio Veronica and Radio North Sea International also closed, though Radio Caroline and its new Belgian partner Radio Mi Amigo defied the act and remained on the air.)
It was originally intended that programmes would begin on 15 July 1973, using Mi Amigo's 10-kilowatt transmitter on 773 kHz (388 metres, announced as 385). In readiness for this Atlantis adopted a postal address of Postbus 385, Oostburg, which remained the station's address throughout its lifetime. This plan went awry when it was discovered that Mi Amigo's 773 kHz transmitter crystal had gone missing. The crystal, which was about the size of a matchbox, had been used as a replacement pawn for the ship's chessboard, and had apparently been thrown overboard when the chess set was replaced. Consequently, when Radio Atlantis launched it was on Mi Amigo's 50 kilowatt transmitter, on Caroline's main frequency of 1187 kHz (253 m), although all of the DJ announcements originally gave the wavelength as 385. It has been claimed that Atlantis was the only offshore radio station ever to launch on its announced date, even though it was on the wrong frequency.