Is that an antenna? In a simple, the antenna is a tool to send and receive electromagnetic waves, depending upon the use and the use of the frequency, the antenna can shape the various forms, ranging from cable seutas, dipole, or Yagi, etc.. Antenna is a passive tool without ration power (power), which can not increase the strength of radio signals, such as a reflector on the flashlight, consentrate and help focus the signal. Strength in concentrate and focus radio signals, is a unit ukurnya dB. So when the dB increases, the distance that can reach ditempuhpun increase. In general there are two type of antenna, omnidirectional and directional, omnidirectional antenna to send or receive radio signals from all directions equally, usually used to connect multiple-point or Hotspot. Are directional antenna to send and receive radio signals only in one direction, generally in a very narrow focus, and is usually used to connect point to point, or multiple-point, kind of like the antenna of the antenna direktional grid, Dish "parabolic," Yagi, an antenna and sectoral .
Most wireless networks based on standard WiFi 802.11b and 802.11g, both running on this standard frequency of 2.4 GHz to 2.5 GHz, the frequency of such grouping is called a "band". WiFi 802.11a using the 5.1 GHz frequency and 5.8 GHz.
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