Broadcast TV towers are large transmitter antennas used to transmit over-the-air television signals to receiver antennas in the surrounding area. A broadcast TV tower consists of either a support structure with a separate antenna on the top or a structure which itself functions as the antenna.
Broadcast television towers are among the tallest man-made structures in the world, with several in the United States exceeding a height of 600 yards. Though broadcast TV structures that are supported by additional wires running to the ground are often referred to as towers, these are technically masts rather than towers. True broadcast TV towers are free-standing structures with no additional external supports.