Delisha - Thank you, I could not think of what she used, "filament" that's it! With the OT thread, this thread and others, I am on info overload. Is she "thedragonlady" ? Or another? Might try to PM her to see where she got the "filament" or just search the OT thread. I still have trouble with the search option on threads, doesn't always work for me. Thanks again!
Filament - use fishing line. A pain in the neck to install, and I've read elsewhere on byc that hawks have gone through a pretty small opening, maybe a foot or less wide between the strands. The idea is you either do a wagon wheel/maypole, or you run parallel lines, and supposedly it keeps hawks at bay. Might work if you don't have trees in your run.
Personally, I think you might have better luck with poultry netting, fruit netting, or avian netting.
None of this stuff will stop a hawk sitting on it, but should be a deterrent.