Scored these a few weeks ago:
http://i.imgur.com/7hUN02u.pnghttp://i.imgur.com/LpkT41A.pngFirst image is how they looked after I cleaned 2 of them, and the second image is the other 2 I have yet to clean (4 total).
From my calculations these are 12dbi directional antennas for 2.4ghz and they work extremely well. With my high powered WIFI card I can communicate with stations that are being received at -91dbm (less than 1 bar for you windows kids) with less than 10% packet loss. Of course my bandwidth is super slow since it is trying to prevent packet loss, but still.
Also +1 for who ever can name all the consoles in that second image.
What did you end up cleaning these with. ??
Inquiring minds want to know.