That is annoying! You should be able to vote if they are broadcasting it there.
That said, I don't think people in Ireland should be voting for someone purely because they are Irish. Surely you should vote because you like someone, not because they come from where you're from.
Reminds me a bit of X Factor when someone came from eg; Coventry... Louis Walsh would say 'I want the whole of Coventry to get behind you and vote for you!' What, so even if the act was shite, people still have to vote for them to win, just coz they are from the same town or city?! LOL no.
I remember an act from my county on a reality TV show once and they were crap. No way did I vote for them just because they were from the same county as me! Bit bonkers, and somewhat narrow-minded and insular.