Communications towers must be engineered to withstand wind, ice, and seismic loads. The industry's governing document is TIA-222, the Structural Standard for Antenna Supporting Structures, published by the Telecommunications Industry Association. Collisions ‐ Birds that are attracted to tower lights and aggregate in the lighting zone, circle the tower and collide with the tower, guy wires, other birds, or fall to the ground from exhaustion (Longcore et al. 2012b, Gauthreaux and Belser 2006, Erickson et al. Tower owners must comply with a multi-layered regulatory, engineering, and safety framework that governs tower siting, where a cell tower can be built, how it must be designed, and how it operates throughout its. According to the Federal Communication Commission's 2000 Antenna Structure Registry, the number oflighted towers greater than 199'feet above ground level currently number over 45,000 and the total number of towers over 74,000. By 2003, all television stations must be digital, adding potentially.
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