We are building a coop (almost done) and run, I have seen a setup at a neighbors where she has had success with approx 4 foot tall fencing (open top) surrounded by electric (3 wire) fence. The chickens fly out and free-range during the day and fly over back into the fenced run/coop at night and when predators chase them, usually foxes. Does anyone have a any experience or success with this type of set up? (they will be secure in coop at night)