Bad video quality over WiFi?

iChat seems to be trying to out-think me by lowering iChat video quality when it's on WiFi, but using great video when I'm on ethernet. This seems silly, since I have great WiFi connectivity, but I can't seem to disable the behavior. Does anyone know how to disable iChat's WiFi preferences?
More details:
I'm on an 802.11g WiFi network through an AEBS with "full bars" and the quality looks terrible over Bonjour to someone else on the LAN (wired or wireless). As soon as I disable AirPort and plug in to wired Ethernet, making no other changes other than restarting iChat, the quality looks fantastic.
My WiFi speed is always in the tens of megabits per second, with ping latencies below 1ms to the other clients, so it should be plenty fast.
Ideas?

I have been using iChat exclusively over WiFi (Airport Extreme) from my iMac, and via Ethernet and WiFi from my Powerbook. I have not had any quality issues when connecting in this manner. Connections within my local network from WiFi to WiFi, as well as to outside connections over Broadband have all been of very good quality. Now if I can just get it all working again following the upgrade to Leopard 10.5.1.
FYI: I have even used iChat AV on Tiger using DUN on my Treo650 (Sprint), which worked fine as well.

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as example
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I have been using iChat exclusively over WiFi (Airport Extreme) from my iMac, and via Ethernet and WiFi from my Powerbook. I have not had any quality issues when connecting in this manner. Connections within my local network from WiFi to WiFi, as well as to outside connections over Broadband have all been of very good quality. Now if I can just get it all working again following the upgrade to Leopard 10.5.1.
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