You must correct the busted country code in the card, then it works wonderfully. Use this file

http://kwurmail.wustl.edu/ar5212/ath_info.c

The newer cards have the AR5212 chip, which has some things that prevent the older source thats floating around from fixing the problem. This code gets it done well! Took me 3 hours of googleing to figure it out, and this was in a tools/ package somewhere else, couldn't get its source, had to dl it from an online source browser!