OK attract crows, a murder of crows will attack and even kill a hawk, but I understand Fish and Wildlife have warrants issued for the crows. The crows will take chicks though, so it is not a complete win. Large dogs deter hawks, they are not just a predator but also prey. String clothes line to break the hawks dive, white works the best. Be and look aggressive when hawks are circling, yell wave arms jump up and down. I have more problems with tree rats killing chicks than hawks or even crows. Wish the hawks would take the tree rats away.
BTW it may be a crime to harbor a fugitive crow that has harassed a hawk so be careful who you tell or seen feeding crows.