Yagi Antennas
The Yagi antenna is a highly efficient, directional antenna that transmits and receives signals in a given direction. These antennas consist of three or more parallel elements—one driven element, one reflector, and several director elements—that are all mounted on a boom. The driven element is like the antenna in a typical radio. It radiates signals when driven by an electric current and captures signals when they are incoming. A Yagi antenna is more directive than a simple dipole antenna. It has a beam width of about 30 degrees.
Yagi directional antennas have a narrow bandwidth and directional property that allows them to achieve forward gain. This means that they can take the signal coming from the direction that they are pointed and amplify it while taking everything else that is not coming from that direction and minimizing it. That makes them great in environments like rural America, where you have a couple of towers and you're trying to get signals bounced off of those and some different kinds of obstacles. Mounted on a structure out in the field, Yagi antennas can be pointed toward the terrain in front of them to try to get the best signals while avoiding some other kinds of interference that might come from the sides or above or below the antenna.
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