First of all, make sure your /etc/apt/source.list doesn’t only contain “main” but “main contrib non-free”. And then, update your APT.

1. Update

apt-get update

2. Install Build Environment

apt-get install build-essential module-assistant wireless-tools
module-assistant prepare

3. Install the driver

module-assistant auto-install madwifi-source

4. Load it!

modprobe ath_pci

That’s it! Have fun and happy surfing.