Use twice 0.
This will enable you to use truely world and FCC.
This will enable every channel there is possible by the WiFi standard on the card (including the ones over 100).
I know because I did it with my own card.
I also gave it a reception boost...
Works pretty neatly.
My ROM set:
This one is for Atheros AR9285 0x002B168C.
You could use it if you have one of those.
This will seriously boost your card and update to latest ROM version (I modded some stuff).
They are also separately available from Github:
Don't forget to change the MAC address first to yours (using the tools provided here)!
Done, and it works .... now I have to fix the bluetooth