This female Coopers came thru a 14" square opening and I watched her escape thru the same hole. She left behind a still live ripped open 4 lb hen. Putting the wire/rope up would be easiest for me but seeing what this bird can do I am terrified to give her a chance now. My thought is the rope/wire would have to be spaced no wider than 8"(for a smaller Coopers) because she very gracefully went thru the 14" opening.No. You would just have to try it and see how far apart the wires/rope is. You would want to make sure it is close enough at the fence so a bird's wingspan wouldn't be able to get through. I think most birds would see that and not try it for fear of getting trapped. Trial and error I imagine. I can ask him and see what he says.