Love your trellis gate Twinklin. I've been letting my girls free range as well, and they're now traveling up to the front lawn. I was happy when they stayed on the back and side lawns, but I guess the front lawn has bugs too! I have used the hose to shoo them out of the rose bed. I also have a 1600 s.f. electronet run around their "tractor" (which ended up being too big and heavy to move, so it's permanently parked on some cinder blocks.) The electronet is very easy to move around the yard, and it would be easy to set up around your moving tractor. That would keep the chicken bombs in a predictable area. You could do the same thing with any light wt fencing.