Macbook pro logs plenty of errors on Airport

I run a home network composed of an Airport Extreme and an Airport Express associated in WDS, and a dozen machines coming and going daily.
We recently added a Macbook pro which behaved poorly from the start, with e. g. much longer pings than everyone else.
By analyzing the stations' journals with the Airport Management Utility I discovered that contrary to all other machines the MBP at times did series of associations, one every 20s or so, for hours!
I then turned on the "interference robustness" setting, and the positive result was this ceaseless reassociating ended. It now seems, at least, that the MBP manages to 'stay logged'.
But the issue is not over! the MBP throughput and ping values are still extremely bad, and indeed by reusing the Airport Management Utility, this time on the Monitor panel, I can see that everyone sends and gets thousands of packets with no errors, while the MBP permanently sends some 100 erroneous packets for a single good one (and the received packets ratio is the same). This is very striking, all the most when compared to all other machines (including a 'fossil' Titanium powerbook that connects in 802.11.b).
I suspected an antenna issue, and located the MBP physically against both stations: on the monitor I can see the received level boost up by dozens of dB, but the packet error ratio stays exactly the same.
Does someone around understands what's happening?
What may I do?
Contrary to most of our macs, I don't know at all where in the MBP is located the wifi card, nor if this is user-serviceable or even visible...
TIA!
Hervé S.
P. S. both stations run the latest versions of their software, and all relevant machines are under 10.4.6
many   Mac OS X (10.4.1)  

Thanks for this anyway
There are chances then that it's not an issue of a poorly connected wifi card...
Hervé

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