Hi samatt,
I have just tested it using the command iwconfig wlan0 channel [number] and I wasn't able to change the channel. I'm afraid that feature is not supported just as the output message shows. I believe changing the channel/frequency has to be done in your router. I found these two following sites that you might find interesting:
- http://www.metageek.net/forums/showthread.php?6379-How-To-Change-the-Channel-of-Your-Wireless-Network
- Change Your Wi-Fi Router Channel to Optimize Your Wireless Signal
Regards,
Diego.