Sorry to hear about your chicken. I'm on 30 acres and surrounded by 100+ more acres of uncut land. I think our problem started when weekly people came by the property to train bird dogs. They used 4 wheelers to get around and homing pigeons to train the dogs. I really think the hawks learned...
I recently lost a girl to a hawk and had to do something. My chickens have a permanent run that was here when I moved in. It is welded wire fence but no top. So I got a car port and a net. 10' x 20' car port and 25' x 50' nylon multifilament net. The car port gave me the support I needed to hold...