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an ugly photo, but shows a post, with the bird net around the top of the fence wire.
Measure your run, go to a good hardware or nursery and pick up or order the size net you need, they come in lots of sizes !
When you get the net, and need support such a big wide pen, stretch 50# monofilament over the pen, maybe need a post in the middle to support it all, I have an old clothes line post in this run.
After the monofilament (fish line) attach the bird net on one side and pull it over, attach on the other side with tir wraps, cable ties.
There is no way an eagle can get in unless he dive bombs the net, and even then, he will probably bounce back like a trampoline.
Birds of prey are extremely terrified of wires and nets.
He cannot get in this net.
It is ugly, but it is in the back of the barn, so it really does not show.
Hope it helps.
P.S. I have never seen a bird of prey get stuck in a net like this, they have excellent eyesight, and like you someone just said, he will no doubt land on the roof and look at the net and decide he cannot get in.
This gives the chickens time to run.
Oh, and by the way, took the design from Greg Richardson...we have seen raccons run around this fence every night, on our wildlife camera, but none have climbed the fence !
The sharp spikes on top and down the wooden posts stopped them cold !