Wireless packet loss, can something be done?

[kitepilot at kitepilot.com]

Hello group... 

I am having this erratic packet loss in some of the branches of my network.
One bridge loses 14% of the packets while the next one, couple of hundred 
feet away and associated to the same AP, is ticking away like a sunny day...
The APs are Wiligear radios and the bridges are Senao CB3. 

It's puzzling and contradictory... 

I know that network is far from being loaded to capacity, and I have ran out 
of ideas to check...
Ideas anyone?
Thanks!
Enrique