I free range my birds but they keep going in the neighbors corn fields. Its not a huge deal when its only 5 birds but when i let the babys out it will be 25. Not thinking the neighbor will be too happy about that. I need to keep them out of the garden too. My coop is 25x25. I need a run. It only needs to hold the chickens in. I'm going to move them into a bigger building in a couple years so i dont want to spend a lot on this fence. How high does it need to be? I also would like it to be big enough for at least seventy five birds. We are getting more birds next spring. They will get to free range a couple hours each day when i can watch them. Thanks!