This gem is from
https://twitter.com/KillianM2
It's an image of the TV and Radio listings on the 31st of October 1977 from the Dublin Evening Press. You might notice that RTE is right at the end of the page, and in the TV Preview Column, it's all about UK TV Programmes except for a bit added on at the end about the uninspired choices on RTE

The Evening Press was Generally a Dublin Paper with a Nationalist outlook but they did the listings the way their readers wanted.
By 1977, a large chunk of the Irish republic had access to the UK channels, either via spill over from Northern Ireland or Wales, or via cable television available in Dublin, Waterford and a few other areas, so the television listings were going to provide extensive UK channels schedules. RTE only had one television channel and one main radio station at the time, not much choice from RTE.
I always wondered why we got listings for HTV. Back then I thought it was so random but makes sense now that there's overspill from wales. Amazing how far signals can go.
I know people in Arklow, County Wicklow had a great reception of the UK channels. A lot of people from Dublin to Waterford pointed their aerials out over the Irish sea, and as analogue was not an all or nothing signal like
DTT is now, you could pick up a reasonable signal of BBC and ITV. This meant people living in Arklow, County Wicklow say in 1977 could receive RTE Television, BBC 1 Wales, BBC 2 Wales and HTV Wales, meaning they have four channels, whereas us in Britain had just three.