I am sorry you can't free range. It is one of the things I enjoy most about having chickens. Watching them wander about doing what chickens do. I don't seem to have the predator problems that others do (Knocking on all the wood I can find!). We have foxes, coyote and both black bear and grizzlies but I have a lot of dogs on my property and it keeps those kinds of predators at bay. We also do not have any raccoons for which I am very thankful.
We have airborne predators but the harriers control the territory around our place and they are not interested in the full grown chickens. We have bald eagles in the winter but they too have shown no interest most likely because of the dogs. That doesn't mean it can't happen and if I began to lose chickens I would have to change things here too.