From this site Guglielmo Marconi made the first public transmission of wireless signals on 27 July 1896

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See also...
Spudgun67 on Wikimedia Commons
Peter Reed on Flickr
rw_norris2000 on Flickr
cazphoto.co.uk on Flickr
Robin Lucas on Geograph
Stuart Axe on Flickr
Kay Atherton on Geograph
Elliott Brown on Flickr
Nick Harrison on Flickr
Simply Jan on Flickr
Simply Jan on Flickr
Eugene O'Loughlin on Flickr PD 1.0
Nick Harrison on Flickr