I don't know if you have all seen the write up by CanberraUAV however Andrew replied to a question with this:
"Comment by Andrew Tridgell 11 hours ago
We ran the Ubiquity radios in normal AirMax mode. We used it to send UDP packets encapsulating a protocol we invented for the event that we call block_xmit. That is a reliable block sending protocol that is particularly good in high packet loss environments. We got about 25% packet loss during the flight, so sending images and data using block_xmit helped a lot. It wouldn't have worked at all if we'd relied on a TCP video stream like is often used between buildings.
Also, we didn't actually need hi-res images sent to the GCS for the mission. We did soak up spare bandwidth (at 30kbytes/s) between the plane and the ground with compressed images, which gave us something nice to look at while we were waiting for it to find Joe, but if they hadn't come through it wouldn't have mattered. The key was sending the tiny thumbnails and python objects that come from the Joe recognition algorithm running on the plane.
He says he saw a 25% packet loss and had to write his own protocol for transmitting the video.
JB suggested we start a thread on video so I thought this might be a start.