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,
15,000 Miles in a Ketch his fishing boat, and of the many hardships which they faced with brave hearts. 15,000 Miles in a Ketch 15,000 Miles in a Ketch is a non-fiction book written by French explorer and sailor Captain Raymond Rallier du Baty, published by Thomas Nelson and Sons in 1922. The book describes Captain du Baty's experience on the voyage of the "J.B. Charcot", a small French fishing ketch which weighed 48 tons. The aim of this voyage was to chart the subantarctic Kerguelen Islands, which they funded by hunting southern elephant seals in the local area and selling their oil. The crew