This stone marks the site of the Needles Wireless Telegraph Station where Guglielmo Marconi and his British collaborators carried out from 6th December 1897 to 26th May 1900 a series of experiments which constituted some of the more important phases of their earlier pioneer work in the development of wireless communication of all kinds.

See also...
Nick Harrison on Flickr
Rbirkby on Wikimedia Commons
Peter Reed on Flickr
Alwyn Ladell on Flickr on Flickr
Robin Lucas on Geograph
kokeshi on Flickr
Stuart Axe on Flickr
Kay Atherton on Geograph
Elliott Brown on Flickr
Nick Harrison on Flickr
Simply Jan on Flickr
Eugene O'Loughlin on Flickr PD 1.0
Nick Harrison on Flickr