Wifi connections at distances up to several MILES are possible with high gain directional antennas.
This video illustrates the building of one of the many wifi antennas at http://www.ab9il.net that can be made with inexpensive parts, common tools, and precise assembly by hand. This is the most popular antenna, though the parabolic reflector provides the ultimate in long range wifi connectivity.
If you are trying to cover a large parcel of land or perhaps reach a community wifi network, this project will get you a signal more than ten times as strong as on a simple dipole antenna.
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