Only one mac out of six has a speed problem

I have two Mac Minis, a MacBook, two Blue and White G3s, and a Gigabit G4.
Five of the computers return a 2.0 Mbps D/L speed when I run the ATT speedtest page for my DSL.
The MacBook returns a 375 Kbps DL.
Speedtests were run over a couple dozen times and speeds reported have been very consistent.
Why? Location doesn't seem to matter. Two Macs are in another room and the MacBook is in the same room as the wireless router and three other Macs. Yes, I moved the MacBook around and currently it's only 4 feet away from the router and within 2 feet of the three other wireless Macs.
All machines are running 10.4.8 with all updates applied. Essentially there should be no difference between the MacBook and the two Minis... similar processors and software.
I'm not a noob when it comes to the network settings and there is nothing setup different in the MacBook other than the static IP address of course.
What could be going on here to cause the DSL download speed of the MacBook to be only 16% of the other 5 computers?
Thank-you.

I think that a continuous, realtime monitoring of
available wireless networks could results in two kind
of problems: the software accessing the wifi card
resource, thus blocking access by the legitimate
manager software, and the network bandwidth being
occupied by continuous attempts of testing network
presence. The latter problem could partially hurt
also other connected computers, though it is divided
among 13 channels, only ne of which being really used
by your real network.
I agree.
This kind of problems is much more present in
Bluetooth, where the so called "aggressive polling"
is able to produce the equivalent of a denial of
service.
I also have Bluetooth turned on.
As long as just CoconutWiFi is killed, my speed is back to normal even with my Bluetooth.

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