I have a similar problem with ath9k with the AR928X wireless chipset.
(Asus N50vn)  It is not as pronounced, however, I only get 80 percent
reception holding my laptop directly on top of my wireless router's
antenna.

I downloaded the source for 2.6.28 and 2.6.30-r8.  Unfortunately, the
above patch is for 2.6.29, and one cannot simply include the lines and
recompile for either kernel (Jaunty or Karmic.)  This problem does seem
solvable upstream.

The 2.6.30-r8 athk9.h file is very similar to the 2.6.29 driver code cited in 
the attachment at: 
http://bugzilla.kernel.org/show_bug.cgi?id=12930

This following blueprint for karmic may prove useful:
https://blueprints.launchpad.net/ubuntu/+spec/kernel-karmic-wifi

It may be possible for an Ubuntu developer to communicate with Senthil
Balasubramanian and still apply this patch.

-- 
Very weak signal using ath9k compared to Windows driver on same machine
https://bugs.launchpad.net/bugs/379861
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