Question : Linksys Router

I recently purchased a Linksys Router WRT54GS with the WiFi USB adapter (came together in one package) , it worked fine when the desktop I was using was on the other side of the wall from the wireless router, now I have to the move the computer a distance away from the router, and the speed is decreased a lot, 11 MBPS is the best I can get, and I was able to get a lot more before.  I know the distance can be causing part of the problem, but is there anything else I can do to increase the speed I am getting, I didn't change anything when I installed the router and adapter just went with the vanilla install, so if there are any modifications I can try that would be great, I have read a little about channels but am not sure if the router I have has the ability to change the channel or if that would even help.  Any help anyone can provide would be greatly appreciated, or even a link to a knowledge base article, I tried but couldn't find much.  Thank you in advance.   Also what is a max range for a wireless router/adapter connection?

Answer : Linksys Router

Linksys has a matching Range Expander
http://www.linksys.com/servlet/Satellite?c=L_Product_C2&childpagename=US%2FLayout&cid=1130267578138&pagename=Linksys%2FCommon%2FVisitorWrapper
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