This post shows how to set the correct regulatory domain in OpenWrt to allow the selection of the correct frequency ranges for your country, using the crda package.
Open a shell on your router, and update your package list and then install crda with the following commands:
opkg update; opkg install crda
Add the following line to your /etc/profile
Add the following line to each radio section you want to regulate in your /etc/config/wireless
option country US
Put your country as appropriate (i.e. IT).
Reboot your router, then type:
iw reg get
to check the available frequency ranges for your country, and:
to check the nearby wireless networks.
- OpenWrt forum