Radio masts and towers Radio masts and towers Radio masts and towers are, typically, tall structures designed to support antennas (also known as aerials) for telecommunications and broadcasting, including television. There are two main types: guyed and self-supporting structures. They are among the tallest man-made structures. Masts are often named after the broadcasting organizations that originally built them or currently use them. In the case of a mast radiator or radiating tower, the whole mast or tower is itself the transmitting antenna. The terms "mast" and "tower" are often used interchangeably. However, in structural engineering terms, a tower is a self-supporting or cantilevered structure,
Ketch the latter part of the 18th century. The ketch continued in use as a specialized vessel for carrying mortars until after the Napoleonic wars, in this application it was called a bomb ketch. The original "Atlantis", the seagoing research vessel of the Woods Hole Oceanographic Institution commissioned in 1931, was a steel-hulled ketch. In 1989 Bruce Farr designed the Maxi ketch "Steinlager 2", the first maxi yacht built of composite carbon construction. This revolutionary lightweight design went on to win the Whitbread Round the World Race in 1989/90. In 1947 a radio program called "Voyage of the Scarlet Queen" was