What model of Atheros card are you using? I found a link that discusses the ath9k driver. This driver works for all Atheros IEEE 802.11n PCI/PCI-Express chips. It also has a section for enabling the driver you may find useful.
Thanks Sergio for this info.
The chipset of my card is AR2425 and the related page of the driver is https://wireless.wiki.kernel.org/en/users/drivers/ath5k .
My problem is how to download the binary (module), and if I can either patch the SD image with modprobe (for example) or doing something else to let it working.
I have wrote to balou1974 , In a post he let understand he solved the problem. I hope to receive an answer