This structure is where Marconi received the first wireless message from England......known as Cabot Tower.......Signal Hill is the high peak overlooking the entrance to St. John's Harbor
http://www.nrgnet.com/Newfoundland02/3212.html
http://www.eastwaters.com/signalhill.htm
http://www.newfoundlandtravelguide.com/
http://www.cdli.ca/CITE/kiexp.htm