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Cell towers (or cell sites) that hold antennas and other communications equipment. They flood the area for miles around with powerful high frequency radio waves (known as microwaves) to support the use of cellphones as well as Wi-Fi, WiMax, Wireless LANs, 802.11 networks, Bluetooth supported devices, and more.
Cell towers (known as mobile phone masts (Britain) or base stations) typically contain transmitter/receivers transceivers, control electronics, a GPS receiver for timing, digital signal processors as well as various types of electrical power sources.
These microwaves might travel for as few as 2 miles in hilly areas, and up to 45 miles where there are fewer obstructions, and of course, they easily penetrate brick and metal.
Other forms of cell towers include:
Radio masts - Smaller versions of cell towers, often seen on rooftops and billboards, typically installed 800-1300 feet apart.
Mobile towers - Sometimes installed on the tops of buildings. Mobile towers are also used where there have been natural disasters, or when large numbers of people are temporarily expected (i.e. a major sports event)
Mobile towers are especially dangerous because they emit microwaves at a frequency of 1900 MHz. Recent studies have shown that the intense radioactivity from mobile phone towers adversely impacts every biological organism within 1 square kilometer.
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