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.
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I suggest you take a closer look, there is certianly two and probably three rings, making it one of the largest, if not largest in the country. A geophis survery would confirm same, however I am sure it is a tri-ring hillfort. The light blanket bog, covering the hilltop has indoubetedly covered most of the earthworks. As an aside, there was certainly something special in this area, it has the higest concentration of banked enclosures (ringforts) in the country. Somebody needs to take a good look here.