The stations provided 24-hour music, with hourly news updates to Dublin City and County. The stations were raided only once, in 1983, leaving Nova off the air for less than a week and Sunshine a little longer because it waited for the District Court to order the return of its equipment confiscated in the raid. Pirate radio had a very noticeable impact on both listener figures and the advertising revenue of RTÉ, which could resort only to frequency jamming of the Nova and Sunshine MW & FM transmitters to try to reduce listenership. The Irish communications minister ordered the then chairman of RTÉ Fred O'Donovan to stop the illegal jamming campaign.