RTÉ Radio 1 is one of the principal radio channels of Irish public-service broadcaster Raidió Teilifís Éireann, which is the direct descendant of Dublin radio station 2RN that begins broadcasting on a regular basis on 1 January 1926. Offering a wide spectrum of programming which is mainly speech-based but also includes a fair amount of music, the station is a rare modern example of a mixed radio channel. As it is the most-listened-to radio station in Ireland, the total budget for the station in 2010 was €18.4 million. Although RTÉ Radio 1 is currently available in Ireland on 88-90 MHz FM and 252 kHz longwave (LW), the LW version of Radio 1, which can also be received across the United Kingdom and parts of Western Europe, is also the only RTÉ Radio service available in parts of Northern Ireland since the closure of Medium Wave.

From the Clermont Carn and Three Rock Mountain high power transmitters via the RTÉ DAB Multiplex, DAB broadcasts of the station began in the east of the country on 1 January 2006. Despite RTÉ DAB is available on the Saorview platform, the listeners to WRN's English Service for Europe and English Service for North America can also hear a selection of RTÉ Radio 1 programs.

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