En:HOWTO: Madwifi-ng
From Sabayon Wiki
1. Install the latest madwifi, you can do this from entropy:
# equo update # equo install madwifi-ng
or from portage (may have a newer version)
# emerge --sync # emerge -v madwifi-ng
2. Blacklist the old Atheros kernel modules
File: /etc/modprobe.d/blacklist
blacklist ath5k
3. Update modules configuration
# update-modules
4. Remove old atheros modules from running kernel
# rmmod ath5k
5. Load madwifi-ng modules.
# modprobe ath_pci
6. Run iwconfig to check its all running:
# iwconfig