Citadel Broadcasting Tower Brentwood is a 372.8 metre high guyed TV tower at Brentwood, Tennessee, USA. Citadel Broadcasting Tower Brentwood was built in 1983.
A mast is a man-made support structure, commonly used on sailing ships as support for sails, or on land as radio masts and towers used to support telecommunication equipment such as radio antennas ("aerials" in the UK).
Most of the taller masts are located in the United States, where a prevalence of masts of around 2000 feet (609.6 m) in height is the result of special rules in that country limiting structures and objects taller than 2000 feet.
The Petronius Compliant Tower is an oil platform standing 2100 ft or 640 m (to the top of the spire) and is the tallest non-guyed structure in existence but is mostly underwater.
Most of the tallest structures are television broadcasting masts, followed by a mix of the taller tower-type structures (like the CN Tower) and the taller high rise buildings (like the Sears Tower).
Scattered among these are other structures including oil platforms, electrical towers, bridge towers, etc. List is organized by absolute height since it includes many different classes of structures.
For categorized lists of high structures, see List of skyscrapers, List of towers and List of masts.