I depend on netting and crows for my hawk protection. I put out BOSS, corn, and bird seed for them. I think the main thing that attract crows though is very tall trees. There are a few acres of tall pines abutting our property and luckily that is a major attraction for crows. They like to roost and nest high. If you have any tall trees nearby, keep scattering corn and other crow favorites. Crows are not a danger to grown chickens and do not tolerate hawks. Be careful about chicks and eggs though. I have always heard that crows will sometimes go after them. I've never had that problem. I keep my chicks covered until they are large enough not to be easy prey and all eggs are laid inside of a hen house that is not easy to get into at all.
I use hardware cloth to cover the top and sides of my run and bird netting over all the paddocks. We also make little hen hideouts all over the property in between paddocked areas. Hideouts are either evergreen shrubs or hoops with landscape fabric and branches or vines over them. I make sure they do not have to run more than 5 feet in any direction to get under cover.
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