This depends on which version of the WUSB11 you have. Turn it over, and in small print in a gray box, it'll have a model number. For example, mine says "WUSB11 ver. 3.0".
If you have the 3.0, it doesn't work. Period. End of story.
If you have the 2.5, it uses the Prism2 drivers, not Amtel.
If you have 2.6, then I'm not sure what's wrong with yours.