Ah, that'n. It's possibly the most anomalous stone I've ever met.
The other end of the spectrum:http://www.themodernantiquarian.com/site/6187 if Mrs Hob were standing next to that one, it'd probably not reach past her knees.
It's a good point you raise Rhiannon. For example, Vybik's photo* (rather snazzy silhouette, mentioned up the thread) made me do a right old double-take when I read the text about it's height. Sometimes you just can't tell. I seem to recall Goff took a pic of a stone up Orkney way
http://www.themodernantiquarian.com/post/32195 (I recall right it seems)
that is comparably deceptive, but has cattle for reference points. Without the cattle, I'd probably have assumed the stone was about 5-6' tall.
But I imagine Goff never goes anywhere without his conveniently collapsible cardboard-cutout cattle collection.
*More of them please Mr VJ