I've fought in several MPC battles against a friend of mine who was playing as France. It seems, there is no hiding from the balooner. I could not hide my troops neither in the woods, nor scrub, even not the light infantry types that are supposed to be able to hide anywhere.
I guess, the balooner adds quite a bit to the general's line of sight as it should be the case
Now, of course, there is the issue of us not being able to shoot down the balooner