In October 2012 the R.O.I. turned off Analogue Terrestrial TV Broadcasts and therefore now only have a Digital TV service. The Broadcast Standard chosen by the Irish Authorities is different to the rest of Europe and as such any Standard Definition TV's bought in the UK or else where in Europe will not work in Ireland.
You can watch British and European programmes via satellite whilst in R.O.I. but not RTE.
If you have a normal TV and want to watch Irish Broadcasters such as RTE then you will need to purchase an Irish set top box in Ireland. Thier equivalent to Feeview is called Saorview.