Yagi was one of the Japanese inventors of directional antennas, the other being Uda, with the invention getting named after them to be called Uda-Yagi antennas in honor of the invention, sometime in the early 1900s. With the multitude of directional antenna designs in use today, Yagi remains the most popular and visible of them all.
Largely used by CB users, amateur radio operators and increasingly by cellular users it is also referred to as the beam antenna. Most of the designs for Yagi antennas will be for the 2.4 GHz omni antenna. Usually the taller they are, for a given frequency, the more gain is laid out on the horizon, where it is needed.
These antennas are designed for optimal operations at the center of the 802.11 2.4GHz band. The Air 802 2.4 Ghz Yagi 8bbi Antenna is a very effective way to increase your cell phone's signal strength especially in rural areas. Basically they are directing a major or almost their entire signal in just one direction instead of dispersing all around a 360 degree circle.
Yagi being a directional antenna has to be mounted above tree lines and pointed directly to your service providers nearest cell tower. It's a single band (800-910 MHz) cellular antenna with the Boom as the main part of the antenna and is constructed of aluminum. The length is 14.5 inches with mount and there are five elements on the boom. Aluminum elements are insulated from the boom to be held in place with corrosion resistant clamps.
Aluminum is a great conductor of electric power besides radio frequency energy. You can be instantly killed if the antenna or support structure touches an electric power line. Never even think of installing an antenna during rain or wet conditions. Finally, don't stand less than 5 feet in front of the transmitting antenna when using a regular 3 watt phone. Also don't install the antenna where the signal has to cross where people will be walking or be able to touch it.
