 It became fully operational on 12 June 1963 with a 625-line service on VHF Band III Channel F. The new RTÉ Radio FM service was added in 1966, and RTÉ's second television channel RTÉ 2 was carried on VHF when it started in 1978.UHF television transmissions from Mount Leinster began in 1996 with the introduction of Teilifís na Gaeilge.The original 1962 mast was replaced in 2010 with a taller one of in preparation for digital television transmissions.