Hi Chris,
As far as I known, madwifi does not support half/quarter channel bandwidth, you can see some source codes for this function, but you still need to do some work to complete it. I have added this function for my devices, if you still have any other questions, we can discuss them together.
Best & Regards
John
 
2012-01-29

John

 
Message: 5 
Date: Thu, 17 Nov 2011 08:41:25 -0600 
From: Chris <bitcpf@gmail.com> 
Subject: [Madwifi-devel] Half/quarter channel 
To: madwifi-devel@lists.sourceforge.net 
Message-ID: 
    <CAKds+cvDcMzFjxGVM=Jaqbv6y48afsWNpkgnFqDhaMaGJYmthg@mail.gmail.com> 
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Hi Everyone, 
 
Has madwifi supported half/quarter channel now? 
If yes, how can I set the radio work in half/quarter channel? 
 
Thanks, 
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