Wireless network drops out on one MBP, not the other

I have two Macbook Pros as part of a wireless network (Extreme/Express 802.11g). Lately the older of the MBPs (2.16 Core Duo) keeps losing the connection and won't recognize the network. If I restart the Airport Extreme and my modem and the MBP it will sometimes come back. Meanwhile my brand new MBP never loses the connection.
Anybody have any suggestions on where I can start looking or what I can start adjusting to eliminate this problem? Please don't hesitate to let me know if there's other info I can provide to help solve this.
Thanks in advance.

If you place the two MBPs side by side for a few hours, does the older device still lose the wireless signal while newer one remains connected?
If yes, then you may have a wireless card that is starting to act up or the internal antenna connector may be making intermittent contact. A repair shop will need to check things out.
If no, then you're likely picking up some form of wireless interference in the area where the older MBP is normally located. The usual culprits are a cordless phone (sometimes at the neighbors) and nearby wireless networks. Post back for a few suggestions on this.

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Wireless network drops out on one MBP, not the other

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