wow yagi-uda antenna can be used now in wifi.
That would be correct. Radio waves are radio waves, give them an appropriate antenna for the magic.http://www.gigaparts.com/store.php?action=profile&sku=NW0054
WiFi Yagi Antenna
This 15 dBi Wireless Yagi Antenna extends your range to lengths you never thought possible!
Are you trying to use your wireless connection in a brick or concrete building? Use this high gain yagi antenna to take your wireless connection outside! Are you having trouble keeping a wireless signal on extreme levels of a multi-floor building? Our antenna strengthens your signal giving you the best signal of anyone in the entire building!
Do you have other wireless users in your area that always interferes with your signal? Use our directional WiFi antenna properties to minimize the interfering signals!
Are you trying to share files with a neighbor down the road -- but your wireless devices can't seem to find each other? Use our antenna to extend the range of your wireless devices -- it will seem as if your neighbor is in the same room with you!
Are you a road warrior who can't seem to keep a connection with your hotel's free Internet access? Our antenna will boost your signal so you can keep your connection while finishing up your important business on the road!
Have you tried driving around your neighborhood to do security assessments for your neighbors, but can't seem to find any access points? Use this antenna and find dozens of networks you never knew existed!
16 Elements and 15 dBi Gain Increases WiFi Signals 32 Times Over a Standard Dipole Antenna