Why does Airtunes Drop Frequnetly under Tiger?

After having sifted through the last week's worth of posts to this forum, I find that I'm having a problem that many others are also having, and that it has yet to be solved. I'm posting yet another thread on this topic, hoping that Apple will take notice.
Since upgrading to Tiger, I've had a bad experience with Airtunes frequently dropping out. Sometimes it resumes playing after a few seconds, sometimes it doesn't. Sometimes disconnecting from my wireless network and then reconnecting fixes the problem, sometimes it doesn't. As far as I know, everything is up to date:
Mac OS X 10.4.7
iTunes 6.0.5 (20)
Apple Base Station v6.3 (that's the firmware)
Software update gives me weekly updates too, so my Airport software should be current (how does one find the version number for this?). This problem also ocured under firmware 6.1. A hard reset of the Airport Express did not fix the problem either.
The strangest symptom that I experience is when Airtunes drops out and I try to deselect my speakers in iTunes. It just hangs and I get the dreaded spinning beach ball. After 2 or 3 minutes it finally deselects. Sometimes if I reselect the speakers, Airtunes resumes working. But other times it just seems dead.
While all of this is going on, my internet connection through the APExpress is still ok.
Airtunes worked flawlessly for me under Panther. So I'm fairly sure that the problem arose when I switched to Tiger.
Anyone know how to solve this problem (other than downgrading to Panther)?

Okay, I've read the posts in this thread and think I might be able to contribute.
My set up is an Airport Extreme Base, with two Express's. I'm new to all this WiFi stuff, and have built this system adding each component over the past two years. So, frequent droping out has also been a problem with my setup. Yet (fingers crossed) i think I got things working pretty well with, ahem, (almost) no drop outs in days.
1. First suggestion is this link.
http://www.macgeekery.com/hacks/hardware/optimizingairportconnectivity
It basically talks about channel switching the Extreme Base Station and how to find out who else might be using that channel. With hints for advanced software from Apple (and where to get it) that I did not have, that helped me monitor signal strength and other neet learning tools.
2. I purchased airfoil recently (great software IMHO), and in the troubleshootong section it talked about how any 802.11b hardware (like my 867 Tibook) automatically down throtles your network from a potential 54 mbps to 11mbps. Now I'm not real versed on what sort of thru put you need to stream this music stuff, but 11mbps probably is not enough for two consecutive streams (w/o constantly dropping out). I have not heard of this potential problem disscussed ANYWHERE else.
3. One of my signals has to travel down a long hallway to reach the Express & speakers, 50 feet, and the signal would always stop when (it seemed as though) I would walk down it. My body seemingly disrupting the signal.
This has seemed to dimminish after my last (#4)suggestion. A house full of people would (i think) kill any signal(s) no matter how strong the signals are.
4. Upon messing around with the settings in the Airport Administrator Utility,
i accidentally had it set to 25% of its potential Transmitter power (under Airport-->Airport Network -->Wireless Options. That fixed alot, boy I felt stupid.
So, these may be things worth looking into. In addition, I have a couple of ?'s.
1. what is the multicast rate? it's under Airport-->Airport Network -->Wireless Options also. what do ya'all have it set at?
2. Would WDS have a positive signal strength effect with an Extreme Base Station and 2 or more Express stations.
I have never run any WiFi under panther, but have had constant drop out issues under tiger until recently (who knows, maybe they'll return)
Goodluck all !!!!
GG-01
PowerMac Dual 2.0 (last rev.)   Mac OS X (10.4.7)   Ti Book 867

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