Poor signal strength on MacBook Pro

We bought a new AirPort Extreme 802.11n for Christmas. Setup was fairly easy. We have two Macs--an 2005 iMac which is plugged into the AE via Ethernet, and a MacBook Pro from mid-2006 that we use in other rooms.
Our problem is that the signal strength on the MacBook Pro is terrible. Even at just 20 feet away, the signal strength varies between 1 and 3 bars (most often just the one tiny bar). The wireless is basically unusable at that point because pages stop loading.
To eliminate interference as a problem, our daughter brought her 2008 MacBook Pro over and we carried it around the house. It had 4 bar strength with no problems wherever we went and held 4 bars for hours while she used it in the kitchen. So we're pretty sure the problem is not interference in our house, unless her newer AirPort card is far better at blocking it.
What could be causing the signal strength on the older MacBook Pro to be so lousy? The computer is a Intel Core Duo, 2.16 GHz, running 10.4.11. The wireless card is 0x168C, 0x86. The wireless network adapter is 802.11 a/b/g, so it's not running "n", but I can't believe that's the only reason it won't hold a good signal. The AE is set up to run "n" as well as the older ones. (Bear with me...this is my first experience with wireless!)
We've been trying everything we can think of to improve the signal but nothing works. When the bars are in the 2-3 range it runs the internet fine, but the problem is that the signal constantly shifts between 1 and 3. So is the AirPort card in the computer that weak?
Any ideas are most welcome. Thanks.

I'll bet this is a hardware/firmware card with a chunk of AEx cards. I have had the same problem with a recently purchased iMac that was assembled in early '08. I tried all sorts of fixes, but ultimately took it in to a local Apple shop. The "geniuses" spent about 30 seconds looking at the machine (failed to replicate the problem), but then recommended replacing the airport card. I just got it back today &, while I can't yet say everything's hunky-dory, I think the problem's been solved. I'll bet there's a service bulletin that the genius bar has access to that describes this issue.
I had the same AEx series you report. I had the problem with 10.5.4 & then with the 10.5.6 upgrade.
See the following lengthy thread for more similar tales of woe: http://discussions.apple.com/thread.jspa?threadID=1815644&tstart=0.
I think this is hardware-related. It's a $183 dollar fix (parts & labor) -- mine was under warranty, but I think there's enough in the discussion forums to justify pushing for a free replacement, even in an older machine.

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