Two Macbooks, same spec, yet one has major connectivity issues

Hi,
I have two (old - 2006) macbooks, bought at exactly the same time, exactly the same spec, probably off the same factory line. Yet one has serious Airport issues which are proving very difficult.
It will pick up a maximum of one wireless network, which it barely is able to connect to. There are 3 wireless networks in this house yet it only picks up the nearest one. The other macbook can pick up at least 15 other networks despite being exactly the same spec and on the desk next to it.
Even when it connects to my network, connections are frequently dropped - over 50% packet loss generally.
Both are running the same OS and are exactly the same spec. I have tried resetting the PRAM, deleting the airport prefs, resetting the SMC; you name it I've tried it. I noticed that this is quite a common issue with Snow Leopard + Airport, but I am now thinking it could be a faulty Airport card. Could this be the case?

You already mentioned that you thought that "it could be a faulty AirPort card". I agreed and offered another possibility as well.
Whether or not you are using Snow Leopard, if you have a faulty wireless card or a faulty antenna connector, you will most certainly have major connectivity issues.
You've already performed all the standard troubleshooting steps and mentioned that you felt it may be a hardware issue.
If you have changed your mind and feel that it's a Snow Leopard issue, (logic would dictate that it would have also affected your other identical computer the same way) you have the option of reinstalling the operating system to see if that might help.

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