Wellfleet is a New England town in Barnstable County, Massachusetts, United States. Located halfway between the "tip" and "elbow" of Cape Cod, Massachusetts, the town had a population of 2,749 at the 2000 census, which swells nearly sixfold during the summer. Nearly half of the land area of Wellfleet is part of the Cape Cod National Seashore and a total of 70% of the town's land area is in some form of protection. Wellfleet is famous for its eponymous oysters, which are celebrated in the annual October Wellfleet OysterFest. Guglielmo Marconi built America's first transatlantic radio transmitter station on a coastal bluff in South Wellfleet in 190102. The first radio telegraph transmission from America to England was sent from this station on January 18, 1903, a ceremonial telegram from President Theodore Roosevelt to King Edward VII. Most of the transmitter site is gone, however, as three quarters of the land it originally encompassed has been eroded into the sea. The South Wellfleet station's first call sign was "CC", for Cape Cod.