What a shame! When someone has named a hill after the standing stones on its low summit, you would think that more care would be taken of them. Both of the stones here have fallen and now liw within a ruined compound.
One of the stones is in a field ditch wrapped in rusty chainlink fencing. The other is only slightly more fortunate, as this appears to have been left where it fell. When standing the latter would probably have been the taller of the two (assuming they were set into the ground by roughly the same amount.) It would have stood a little over 1.5m tall.
This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.
Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.
Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.
The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.
UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.
ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.