Radio Luxembourg
Based in Luxembourg and broadcasting to the U.K, Radio Luxembourg was, in many ways, illegal. But based abroad there was no way to prosecute, much to the joy of teenagers who could tune in every evening and listen to a procession of records, interspersed with ads (making it the first commercial station heard in the country). English DJs flew in to work, making it seem local and friendly. It was so big that there was even a music magazine, Fabulous 208, brought out by the station.
Radio Caroline
Offshore pirate radio didn't begin in 1964. It had started in Scandinavia in 1958, then was copied in Holland in 1961. Outside national waters it was completely legal to broadcast under a loophole in the laws. Radio Caroline took to the air in 1964, the brainchild of Ronan O'Reilly, who had been a record plugger. This, though, gave him opportunities on a much larger scale.
It sold ads, and played 24 hour music, making it a revolution of sound for teenagers. It helped break several new artists, and gave airplay to many artists who'd never have been heard on the BBC. The disc jockeys, who'd spend a fortnight at a time on the vessel, became minor celebrities, feted by teens.
But Radio Caroline, and those that followed, roused the ire of the government. There had been questions in Parliament, and the wheels began grinding slowly to rid the seas of the pirates.

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Where Radio Caroline caught the East and North, Radio London broadcast to the Southeast, anchored a few miles off Southend. Bankrolled by a Texan, Don Pierson, it quickly attracted the name "Wonderful Radio London," making money for Pierson and serving music lovers.
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The Others
Radio City and Radio Invicta soon joined Radio London, whilst Radio Atlanta was just up the coast. Others joined them, old vessels fitted out with basic radio equipment and young disc jockeys who didn't mind braving the primitive conditions. For a while it looked as if the entire coast might be ringed with pirate stations, which had proved more popular with the young than the stodgy and out of date BBC Light Programme.
The End Of The Pirates
It was too good to last. The simple fact was that it couldn't be allowed to last - it was draining too much of the BBC's audience, and the pirates were making too much money. It took until 1967, but finally the government passed a law that closed the loophole allowing the pirates to operate, and on August 15, the pirates were put out of business.
Just a few weeks later, Radio 1 began, BBC's attempt to replace them, using talent that had operated on the open seas. The pirates had changed British broadcasting, opening the doors to more pop music, and forcing the BBC to finally consider the huge teen market for music.
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