Radio Luxembourg was a multilingual commercial broadcaster in Luxembourg. It is known in most non-English languages as RTL (for Radio Television Luxembourg).
The English-language service of Radio Luxembourg began in 1933 as one of the earliest commercial radio stations broadcasting to the UK and Ireland. The station provided a way to circumvent British legislation which until 1973 gave the BBC a monopoly of radio broadcasting on UK territory and prohibited all forms of advertising over the domestic radio spectrum. It boasted the most powerful privately owned transmitter in the world (1,300 kW,[dubious – discuss ] broadcasting on medium wave). In the late 1930s, and again in the 1950s and 1960s, it had large audiences in Britain and Ireland with its programmes of popular entertainment, and was an important forerunner of pirate radio and modern commercial radio in the United Kingdom.
Radio Luxembourg's parent company, RTL Group, continued its involvement in broadcasts to a UK audience with the British TV channel then known as Five until it was sold in July 2010.