This is probably the cheapest wifi antenna around :)
Check it out here:
http://bounav.free.fr
While we're talking about Airport Express, here's Jean-Marie's testimony, which could help a number of readers:
I don't know if this has been pointed out, but the 6.2 Airport Express firmware update is causing some random bugs (no connection). Apple's tech support told me to downgrade to 6.1.1 and it seems to more or less fix the problem. The 6.1.1 firmware can be found on Apple's site: AirPortExpressFW6.1.1.dmg .
So, if you haven't updated to 6.2, wait for 6.3
