Workaround for dropping signal in MBPro and A Extreme Basestation

I've been struggling with an erratic signal in my MBPro 2Ghz 2 Mb, week 15, when used with wireless networks. I tried most of the workarounds posted elsewhere and nothing seem to work. In my case, I would acquire a wireless connection, and then I would watch the signal drop in level, then rise, then drop. Eventually, after the computer was put to sleep, it would never reacquire the network. With the Airport Extreme Base station (v5.7), this was most annoying. I changed all possible settings and preferences, zapped PRAM, reinstalled the system, tried all channels, interference options, etc. I tried with the MBPro literally underneath, a couple of inches away, from the base station, and I could always reproduce this. I set my PowerBook G4 15 1Ghz Ti next to it, and it worked flawlessly, the signal level steady as it could be at max.
I then thought it could be a problem only when in 802.11g mode. So I switched the base station to only work in 802.11b. Voila! Everything is good, the signal is now at max and steady. Wake from sleep now acquires the network fine too. I then switched the base station back to 802.11g/b mode, and the problems came back again. Then, I tried switching the base station to 802.11g alone, and again all was good! In my case, it seems that setting the base station to work only in 802.11g or 802.11b instead of in mixed mode solved all my connection problems.
I have now been running a couple of days without a hitch. I am not sure why working on a 802.11g/b mixed setting would cause problems. There are four computers connected to this base station. Two have Airport Extreme cards, two are older macs with airport (802.11b) cards. In this setup, and maybe someone may correct me if I am wrong, the whole network reverts to work only at 802.11b. So I am not sure why setting it to work only on 802.11b solves the problems for the MacBook Pro.
Any clues why this could be working?

I can confirm this as well. I'm a networking engineer by trade and I use a Juniper Networks NetScreen 5GT Wireless for my home AP and Router/FW. When it's operating in 802.11b/g mode, for some reason, my 15" MBP (brand new) would get ~20-30% packet loss to the WAP itself. Same MBP on an Ethernet connection to the NetScreen gets 0% loss. Sitting my MBP right next to my IBM ThinkPad, same wireless SSID and network (802.11g) the MBP would get the 20-30% packet loss with the ThinkPad getting 0%. I changed the AP to 802.11b ONLY or 802.11g ONLY and the MBP get's 0% packet loss. Turning on debugs on the AP indicate heavy errors when it's in a b/g mode ONLY on the MBP.
MBP 15" 2.16GHz, 2GB RAM Mac OS X (10.4.6)

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I've been looking at some range extenders (like Netgear) but wanted to see if Apple people had a better idea. I want something easy to set up that is "fire and forget." Hence, I am skeptical about Netgear (or Linksys) for that matter.

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