Does the trick, but Mac users may not find things straightforward,
Verified Purchase(What is this?)
I needed a decent wifi link between two buildings, 30m apart with line of sight between two windows. I have an Apple network-n Extreme gadget in the window of the main building, and needed a gadget to communicate with it in the window of the "remote" building. I didn't want external gadgets, which one supplier insisted I need. I wanted a USB adapter to sit inside the window, linked by cable to my Mac
This Alfa item has done the trick. Even with the omni antenna it works pretty well, but with the directional one it works very well.
So why only four stars? Because the Mac drivers on the supplied disk are useless for OS X 10.7, and the Alfa website equally useless. I was able to download a driver from a dropbox account run by another supplier of these things, Crucial Wifi. Given my time again, I would buy from them.
I will be taking this thing with me on my travels to link to wifi networks along the way. It's light and seems well made.