Consumer wireless routers vary in the WiFi range they support. Routers with stronger WiFi signals allow devices to connect at higher speeds from a greater distance and stay connected more reliably. Which wireless router then, has the overall best WiFi range?
Answer: A wireless router's antenna technology generally determines its WiFi signal strength and hence its range. Generally speaking, 802.11g wireless routers offer better WiFi range than comparable 802.11b units due to improved antennas.
802.11n and WiFi Router Range
In general, wireless routers currently offering the best WiFi signal range, however, are 802.11n (sometimes called "wireless N") units. Where standard 802.11b and 802.11g routers contain just one WiFi radio and antenna, wireless N routers contain two or three radios specifically designed to maximize WiFi range. Note that the actual range and performance of any wireless router varies substantially depending on conditions of the environment such as obstructions and radio interference.
Increasing WiFi Range - Do It Yourself
The standard antennas shipped wih wireless routers work omnidirectionally. Omnidirectional antennas distribute their signal equally in all directions. These antennas provide more uniform coverage in a radius, but they also limit the signal's reach in any particular direction.
Some routers support replacement of their standard antennas with upgraded "aftermarket" ones. Many aftermarket WiFi antennas work directionally, meaning their radio signals can be focused in a specific direction. All other things being equal, replacing the omnidirectional antenna on a wireless router with a directional one will increase its range.
Router WiFi Range Only One Factor to Consider
WiFi range is just one of several factors to consider when choosing a wireless router. For example, the reach of a wireless network can also be increased by installing wireless range extender products, or by upgrading a WiFi client instead of the router.
Finally, even those routers with lesser range may service your residence quite well. If your WiFi devices are located near to each other, with few walls and other obstructions in the vicinity, you likely need not seek out a router with the best WiFi range. (Source)
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