Weak Wireless Signals

My wireless connections have been weak lately. I have less bars than I should when my airport is on. I know it is not up to par because my friend has the identical computer (MacBook Pro 1.83 GHz 1 Gig RAM, all the same specs, etc.) and we sat mine and his down next to each other and went to the same websites checked our signals in airport. His signal was stronger and web pages loaded faster.
Anyone have any clues as to why this may be?

I have a 17" core duo,I have trouble connecting to my laptop from 20ft or further from the base station, (closer than 15ft it seems ok), signal goes from 1-4 bars. (my old G3 laptop using a 8011.b card has never had a problem from the same location)
Same problem at a lot of internet cafes even though others have no problems.
But setting my router to 8011.b "only" did stop the wifi signal bouncing from 1 bar to 4 bars.
Using 8011.g appears to get a weak signal on my machine.
I will be trying to get this airport card replaced for one that does work with 8011.g
Anyone else care to confirm this problem?

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