Airport Connection 'Drops' on Mac Pro Running 10.5.6

I have read the many incidents on this forum of Leopard problems / connection inconsistencies via Airport & a a wireless router.
It has become almost impossible to sort the wheat out from the chaff with regards to solutions for this problem.
I have tried the following 'solutions':
Deleting potentially conflicting / out of date preferences,
Clearing / deleting caches using Onyx,
Repairing Permissions,
Creating a new 'location' in Network Preferences,
Using Open DNS service
The connection still drops at least once every hour as detailed in my Bug Report (sent via online form) below:
Any updates on this? Is there a definitive solution, yet?
I don't have the option to rollback the operating system with Time Machine... my Time Machine drive failed just before this. Fortunately, all of my documents are backed up elsewhere.
If you need more info, feel free to ask.
Thank you!
Bug Report below:
Hello,
I have a Mac Pro (profile copied below).
I'm running Leopard 10.5.6
This set-up connects to the internet via a Sky (UK) ADSL wi-fi router (only a matter of months old).
Since upgrading to 10.5.6 I have been experiencing drops in my internet connection every 5 minutes - 1 hour.
Drops = the airport signal strength signal drops from 5 to 1 or 2 bars [but doesn't drop to no bars] and the connection 'fails' -- i.e. downloads stop, pages fail to load, I can't access e-mail accounts.
The connection does reinstate itself, but is much more unstable & from that moment drops much more frequently.
This wasn't happening until I upgraded to 10.5.6
I have a MacBook Pro (one of the original models) and that experiences no connection problems at all, connecting to the same router (the MacBook Pro is also running 10.5.6)
This is incredibly frustrating.
It has rendered my £2500 system useless for work.
I need a solution, badly.
On your own support forums, it appears that there are a number of people suffering similar problems.
Will you please offer a solution / a fix ASAP.
If you need any more information, please do not hesitate to contact me.
Many thanks.
Adam Walton
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 6 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005C.B08
SMC Version: 1.7f10
Serial Number: CKxxxxxxxxx
AirPort Card Information:
Wireless Card Type: AirPort Extreme (0x14E4, 0x87)
Wireless Card Locale: Worldwide
Wireless Card Firmware Version: Broadcom BCM43xx 1.0
Current Wireless Network: SKYxxxxx
Wireless Channel: 1

I had a similar problem which I've fixed!
I have four machines here which can connect to my Netgear DG834N via Aiport. (I say can because they normally connect via ethernet.) My MacBook Pro always used to be fine when connected wirelessly but recently, not aware of any changes I've made, it connects for about 10 seconds then disconnects. All other machines are fine and hold the connection.
This is what I tried before finding my solution:
1) Deleted all references to the network in the keychain and remade them.
2) Created another user to try
3) Changed channels on the router even though I can't see any neighbour's networks.
4) Made sure computer and router were up to date with firmware/software.
I'm assuming that it has to be a computer problem as the PowerMac, iMac and iPod Touch have no issues at all. However, the cure was in the router.
I run with SSID broadcast turned off, WPA2 encryption and MAC address filtering. Allowing broadcast of the SSID cures my problem. Turn it off and the computer connects then drops it ten seconds later. Turn broadcast on and it maintains the connection. I've tried it all afternoon, leaving it connected for about 30 minutes at a time before turning SSID broadcast off again. Works every time! Broadcast SSID - fine, no broadcast - drops after ten seconds.
Now, if only I knew why! And why only the laptop?

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