I was a bit disappointed by the site, it seems to only have one discernible ring around it. The hill itself is 242m high and has great views all around it. To the north you can see the shannon estuary. It is very near the village of Ardagh of the Ardagh chalice fame.
To climb it I just parked at the edge of the road and walked up thru the fields.
On looking at it I wouldnt think this hill-fort had any ceremonial function and I would think it was only for defence / keeping in the cattle.