Noun
English Wikipedia has an article on:pirate radioWikipedia
pirate radio (countable and uncountable, plural pirate radios)
Broadcasting without having the necessary license that covers the territory where the signals are received.
Growing up, there was only classical music on BBC Radio. We had to listen to the American Forces Network in Germany, which played pop songs, or the pirate radio boats off the coast. Michael Caine
Pirate radio sparked the flames of grime in the early 2000s, followed by DVDs (remember them?) such as Risky Roadz and Lord of the Mics. Source: Internet