Careful scrutiny of the satellite map revealed a road crossing west to east, north of Croaghmeen.This turns out to be an access track to a wind farm, and although not tarred, has a decent surface. This road can be accessed from the main Donegal to Ballybofey road, before you reach the Barnesmore Gap. If travelling north, take the second turn right after the large church on the right hand side. Go down here for a short distance, take a right at the junction, then your first left. This is the road for the wind farm.
Starting at the road's high point H 02960 81206 G it's a relatively short ascent, though the terrain is a bit on the awkward side. A minor rise is crossed, before passing the diminutive reed-lined Lough Ancarn. There's a final short pull to a featureless summit - take your pick from the couple of heathery rises vying for the highest point.
There's a vast swathe of wild country hereabouts, though wind farms have very much intruded on the landscape. Linkback: https://mountainviews.ie/summit/827/comment/18604/