Visited 26.05.12
I have forgotten the details of my route to Windy Edge however I do have the echo of it being a long slog over rough terrain.
According to Canmore ID 67908 (go to Links) the stone “belonged to a stone circle with a diameter of about 135 ft, six stones of which remained at the end of the 18th century.”
The area is now forested and only two stones remain, a c. 4.5 foot stone leaning at 45 degrees and a prone c. 6 feet stone which lies c. 45 yards E of the leaning stone according to Canmore ID 67908.
On my visit I was not yet a devotee of Canmore (or RCAHMS) so I didn’t look for the second prone stone in the vicinity.