Video playback hesitates over Airport connection

Hope someone can help with this. I have an eyeTV device hooked to a Mac Mini that records shows to an external firewire drive. I also have a 12" PB that I (try to) use to watch the recorded shows. I have the eyeTV software loaded on the PB, and mount the drive with the recorded shows on the desktop of the PB. The eyeTV shows are mpeg-2 and are about 1.5 Gb/hour. When I connect via my hardwired etherenet, playback is fine. However, when I connect with the airport, playback hesitates about every 3 seconds, so much that it's really not wachable. I've tried turning off the WPA 2 security (no effect), increasing the multicase rate (perhaps a small decrease in heistation, but not much), using inteference robustness (much worse), changing the channel (no effect) to try and alleviate the hesitation. Interestingly, the mini also has an airport (both g cards) and if I create a peer to peer network, playback is without hesitation. Anyone have any ideas about how to discover the cause and fix the problem? I would really rather watch the playback via the secured WiFi network.
dytis

So your Mac mini and PowerBook both connect wirelessly to the wireless basestation. Is that how your network is configured?
If that is true,
The streamed movie must travel wirelessly from the Mac mini to the basestation. during this time, no data can be transmitted from the basestation to the PowerBook.
Then the data is transmitted from the basestation to the PowerBook. During this time no data can be transmitted from the Mac mini to the basestation.
So the Mac mini streams some data, stops and waits for data to go from basestation to PowerBook, then the Mac mini can stream some more. So the Mac mini's transmission (and PowerBook's reception) is not continuous.
When you create a computer-to-computer network, the transmission can run continuously from the Mac mini to the PowerBook.

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