How is the performance of Yagi Antenna?? (wanna buy one)?

my laptop is located 165 feet away from the router, and there are a lot of obstacles between them (doors and wall), will this Yagi antenna
http://cgi.ebay.com/NextG-USB-Yagi-802-11n-WiFi-Antenna-NO-LOSS-laptop-/400131388841?pt=LH_DefaultDomain_0&hash=item5d29b075a9
allow me to boost my internet experience? how is the performance compared to the wired connection?
 
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