Thanks for the review. I would guess that cable loss would be a problem if you used more than a few metres. Did it work better without the 3m extra cable ?
Also can you estimate how accurate the aim needs to be ? One degree ? Ten degrees ? Also in the horizontal and vertical planes.
Did you try one of the lower gain yagi antenna in the same application ?
I assume the other end was some sort of omni-directional wireless access point and you used this to get connectivity at a greater range.