The Italian national broadcasting company is RAI – Radiotelevisione Italiana, founded as URI in 1924. RAI transmits thirteen channels: Rai 1, Rai 2, Rai 3, Rai 4, Rai 5, Rai News 24, Rai Premium, Rai Movie, Rai Sport, Rai Storia, Rai Gulp, Rai Yoyo, Rai Scuola (all available also in high definition). RAI also broadcasts via satellite and is involved in radio, publishing and cinema. RAI has the largest audience share (45%) of any Italian television network. Proceeds derive from a periodical standing charge (90 euros for each household in 2017) and from advertising. The main competitors of RAI are Mediaset, the biggest national private broadcaster, divided in twelve channels (two of which are both SD and HD), La7 and La7d, owned by Cairo Editore; other competitors are Sky Italia (with three FTA channels) and Discovery Italia (with seven FTA channels).