While there is no so obviously significant an event like the
Wright Brothers flight at Kill Devil Hill, NC, 17 Dec 1903 to mark the
invention of radio, a real milestone in the centennial of a public
demonstration of successful amplitude modulated spark transmission is
tomorrow, 2 Sept '05.
http://users.adams.net/~jfs/mccarty.htm
http://earlyradiohistory.us/1903mcca.htm
This story is not an internet factoid; I have verified the
primary source of this citation.
http://www.digitaldeliftp.com/LookAr..._networks.html
http://www.sfmuseum.org/hist/elwell.html