I have a Masters Degree in Electrical Engineering and been an EE for over 15 years. Bought this antenna and did lots and lots of testing with advance software and equipment. No gain at all. Its pure junk. Sent it back for a refund. What a rip off.UPDATE 06/23/2012: Discovered 1 year ago product from ubnt.com called Nanostation2. What an incredible antenna. It will blow your mind as to price and performance. 10 mile capability. Bought 2 of these. AMAZING performance.