Some further info, the 802.11 g runs at 54 Mb/s but only up to about 10 mtrs range.
As the signal gets weaker it reduces its data rate from 54 to 48,24,12,6,3,and down to 1 Mb/s
At its max range of about 100 mtrs, its rate is only 1 Mb/s.
These measurements were taken from the Link Monitor on my laptop when I did the original tests.
1Mb/s is plenty fast enough for a robot data link, but not enough for decent video.
But, as I said before, only when the link is static, not moving.