The STER, (short for Stichting Ether Reclame, in English: "Foundation for Ether Advertisement") broadcasts radio and television ads on the NPO. With the income from these part of the costs of public broadcasting are paid for.
STER was founded in 1965 as the Stichting tot Uitzenden van Reclame ("Foundation for the Broadcasting of Advertisements"); the name was changed to the present name in 1967. STER is most famous for Loeki de Leeuw, an animated puppet which appeared at the beginning and ending of all of STER's commercials from 1972 until 2004.
STER may not use more than 10% of the airtime per year on advertisement and daily not more than 15% and also not air ads within programs (like what happens on the Dutch commercial stations). For programming with long runtimes, like UEFA Champions League events, they consider the pregame, each half of the game, halftime, and the postgame as separate programs in their programming guide and air ads between them. STER is responsible for the contents of the ads which have to be strictly separate from the programs on the public networks and not influence the programming. Complaints about ads can be made at the Reclame Code Commissie (in English: "Advertising Code Committee", comparable to the Advertising Standards Authority in the UK). STER contributes about 200 million euro to the total budget of 900 million euro (2013) of the Dutch Public Broadcaster.