You can't get them, I asked RTE the same question recently and got the following reply.
"RTÉ has no current plans to make its television services available on a satellite free-to-air service. Approximately 50% of our programming is acquired from UK and American sources. RTÉ only purchases Irish rights to these programmes. If we were on a free-to-air basis these programmes could be viewed outside of Ireland and RTÉ would be in breach of its rights agreements with the suppliers of this source of programming. Being available on a subscription satellite basis on Sky enables encryption which prevents access to RTÉ outside of the island of Ireland. This means that availability on Sky satellite is within our rights agreements.
RTÉ is obliged by law to provide a transmission network for its radio and television service. Our analogue terrestrial network fulfils this obligation. Looking to the future the Government has authorised the beginnings of the provision of a digital terrestrial television service. When this is up and running people in Ireland will be able to receive a wide range of channels via the existing (and upgraded) terrestrial transmitter network with much improved quality of picture and sound. The EU has suggested 2012 at the date for the switch over from analogue to digital for television services. On this basis the new digital service should be up and running within this timeframe."