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Radio Mercur - History (1)

The idea for the station was conceived by a young Danish man - Peer (Peter) Jansen - to challenge the monopoly of the state radio network and the mundane programmes it broadcast.  In the mid-1950s Danish State Radio played only one hour of ‘popular’ music, but this was not the rock and roll music that young people wanted to hear.In fact there was a strong official reaction, against the spread of rock and roll and in some cities concerts by groups playing such music had been banned. The Danish press too were hostile to the new music genre and warned of its corrupting effect on the morals and behaviour of young people.

As with many other young people Peer Jansen  was an enthusiastic listener to Radio Luxembourg and the American Forces Network and had also heard the broadcasts of the Voice of America, transmitted from the ship USCG Courier anchored off Greece while on a visit to the Mediterranan.

This knowledge sparked an idea in Jansen’s mind - could  broadcasts from outside Denmark, based on a ship in international waters funded and through the sale of airtime to advertisers provide  the means to launch a popular music station?  He consulted with his cousin, Borje Agerskov, then a law student in Copenhagen,  who identified that loopholes in existing legislation would allow them to base a transmitter on a ship anchored outside Danish territorial waters – and therefore outside the reach of Danish law.

Jansen persuaded his then employer, silversmith Ib Fogh, to invest in the project and in November 1957 the company, Radio Mercur A/S was formed with Jansen and Fogh as the two principal shareholders.


In great secrecy a former German fishing vessel, Cheeta, was located, purchased and taken to Stege, a small harbour south of Copenhagen, to be fitted out as a base for the new radio station.  

To circumvent the Danish laws and regulations which prevented unauthorised broadcasting stations a complicated chain of foreign-registered companies was created. The Cheeta was purchased by a SCheeta being fitted out as a radio shipwiss-based organisation which then leased her to an advertising agency whose registered office was in Liechtenstein. The ship herself was re-registered in Panama and flew that country's flag whilst at sea, as required by international maritime regulations.

Although unlicensed broadcasting within Denmark was illegal, the management of a radio station and recording of programme material for later transmission from a base outside the country was not against the law - at that time. The new station, Radio Mercur, set up its offices and recording studios in the Copenhagen suburb of Gentofte while advertising time was sold through a separate, Danish registered, company Mercur Reklame, also based in Copenhagen.

Radio Mercur engaged its own orchestra, a 16 piece jazz band, led by Ib Glindermann to record many music programmes and concerts. Glindermann also composed the station’s ID signal and music.

Throughout the spring and early summer of 1958 transmitting equipment, and a programme playback facility, with two tape recorders and a small mixer unit, was constructed by Willem Peterson (a bicycle mechanic and amateur radio enthusiast) and  installed on board the Cheeta  at Vennike’s Shipyard  in Stege. The station’s signal was to be beamed from a directional antenna which the onboard control room staff were able to keep pointing at the target listening area no matter which direction the ship rode at anchor.

The conversion work had been carried out in great secrecy, but two articles which appeared in the press  -(Dagblad Cliffs on 31st May and Ekstrabladet on 3rd June)  speculated on the possible arrival of commercial radio aimed at Danish audiences. At first Radio Mercur created a smokescreen story about who was behind the planned station citing ‘Directors based in Switzerland’ in an attempt to confuse the authorities, and it worked for a while.The Danish Posts and Telegraph Department even paid a visit to the Cheeta in Stege, but took no action against the ship.

The eventually vessel left port on 11th July 1958 and anchored in international waters south east of Copenhagen, but was later moved to a new anchorage south of the small island of Ven in Oresund.

Test transmissions from the station's 1.5Kw transmitter started on 17th July with regular programmes planned to start two days later. Unfortunately after a few hours of test broadcasting Radio Mercur faced its first real crisis when the Cheeta's anchor chain broke and the ship drifted helplessly towards the Swedish coast, eventually running aground near Malmo. Damage had been caused to the station's transmitting equipment and part of the aerial mast had also collapsed.

Unable to free herself the Cheeta was towed to the port of Limhamn in Sweden for repairs and returned to her anchorage on 25th July 1958. Test broadcasts started again on Thursday 31st July, this time without any further incident.

Radio Mercur officially began transmitting regular programmes from 6.00pm on SaturdayRadio Mercur's first publicity brochure 2nd August 1958. Europe's first commercial offshore radio station was on the air. Unfortunately technical problems, partly caused by unusually heavy seas and the transmitter running on low power, meant that many listeners were unable to pick up the opening evening’s programmes - which had been sponsored by some major advertisers.

Also at the time many potential listeners did not possess an FM receiver  and over subsequent weeks there was a surge in demand for radios able to receive FM signals as well as aerials to help improve reception of Radio Mercur.

On 14th August the Panamanian authorities (acting on a request from the Danish government) threatened to withdraw the Cheeta’s official registration and the right to fly that country's flag unless the station ceased transmissions. Radio Mercur ignored the ultimatum and continued broadcasting so, ten days later, the Panamanian government carried out its threat and withdrew registration of the radio ship.

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Cheeta being fitted out as a radio ship during the summer of 1958

Radio Mercur’s first publicity brochure

Click images to enlarge

Cheeta at her first anchorage, July 1958

Radio Mercur’s programmes were immediately popular and manufacturers soon began advertising aerials designed to help listeners receive or improve reception of the new station.

Ingemar Lindqvist

The Danish press portrayed Radio Mercur as a pirate - a label which was later applied to offshore stations in many other countries

Ingemar Lindqvist


Key Dates

Ship and Location




Key Dates Ships and Location Technical Staff Programmes

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In the Special Exhibitions Gallery on the Ground Floor

Mercur 60 Intro

Cheeta aground near Malmo, July 1958

Photo: Hans Knot

The Guardian

30th September 1958

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Radio Mercur Scandinavia