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

Photo of Guglielmo Marconi grey plaque
Spudgun67 on Wikimedia Commons
Photo of Guglielmo Marconi grey plaque
kokeshi on Flickr
Photo of Guglielmo Marconi grey plaque
Man vyi on Wikimedia Commons PD
Photo of Guglielmo Marconi grey plaque
Julian Osley on Geograph
Photo of Guglielmo Marconi grey plaque
Matt From London on Flickr
Photo of Guglielmo Marconi grey plaque
peterolding on Flickr
Photo of Guglielmo Marconi grey plaque
Spudgun67 on Wikimedia Commons

Newgate Street, London

Colour: grey

Wikimedia: {{Open Plaques|plaqueid=2389}}

Flickr: openplaques:id=2389

See also...
Photo of Guglielmo Marconi marble plaque
Eugene O'Loughlin on Flickr PD 1.0
Photo of Guglielmo Marconi gold plaque
Simply Jan on Flickr
Photo of Guglielmo Marconi gold plaque
Simply Jan on Flickr
Photo of Guglielmo Marconi, Wireless Telegraph Company Limited, and Nellie Melba bronze plaque
nick.harrisonfli on Flickr
Photo of Guglielmo Marconi blue plaque
Spudgun67 on Wikimedia Commons
Photo of Guglielmo Marconi blue plaque
Pete Reed on Flickr
Photo of Guglielmo Marconi blue plaque
rw_norris2000 on Flickr
Photo of Guglielmo Marconi and Nellie Melba blue plaque
cazphoto.co.uk on Flickr
Photo of Guglielmo Marconi brass plaque
blech​ on Flickr
Photo of George Kemp and Guglielmo Marconi blue plaque
Kay Atherton on Geograph
Photo of Wireless Telegraph Company Limited and Guglielmo Marconi blue plaque
Stuart Axe on Flickr
Photo of Madeira Hotel, Court Royal, and Guglielmo Marconi blue plaque
Alwyn Ladell on Flickr