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 and Indian seas to outside Melbourne Harbour in July 1909. The voyage totalled a distance of 15,000 miles, which is where the name of the novel originates. Although du Baty's native language was French, 15,000 Miles in a Ketch was first published in English. It was later translated to and published in French in 1991 by Ed. maritimes et d'outre-mer under the title, Aventures aux Kerguelen. Since Francis Drake went round the world in the Golden Hind there has perhaps been no voyage quite so venturesome as that in a little French fishing ketch, of forty-five tons, called the J.B.