We free-range, and I see the hawks out there, but we haven't lost anyone - yet. We provide lots of cover for them to run to, there's lots of trees and bushes. They hide underneath the second story of my little girl's playgym, too. Our roos tend to send everyone running for cover. Even with crows and turkey vultures, who are mostly scavengers.
The woman I got my chickens from lived about a mile away, and lost 4 hens and a guinea in one afternoon. She kept hers enclosed in a run with no net, and no cover. They were - excuse the expression - sitting ducks. They couldn't carry the hens off, but hit them hard enough to kill them.
Good luck with your decision. We choose to free range, but the predator threat is *ALWAYS* there.
As for Freecycle.org - it ROCKS! My husband picked up 300+ feet of chain link with the poles and a gate for FREE about a month and a half ago. Freecycle also keeps me in more egg cartons than I could possibly ever use, LOL.
Em