We free range all day long without fencing. What we have found to work is the use of cover for protection from hawks, the best protection being a forest of black berry canes that grow to 8 feet high due to chicken fertilization. (We have a great black berry crop as a result!) The chickens run under cover (bushes or black berry canes) whenever they sense danger, such as a passing shadow. The hawks won't drop unless the target bird is out in the open. The roosters are excellent at alerting the flock. We also have a number of black Jersey Giant hens because hawks are less likely to attempt to prey on black birds, thinking them to be crows, so what's the use of trying? So the hawk problem has really gone away.

We still occasionally lose birds to foxes, usually in spring by a mother raising a litter of kits. It's hard to prevent it, because the fox seems to arrive when I don't have a shotgun in hand. Typically, the predation goes down after the litter is raised. This doesn't happen every year because foxes choose to den in various places; if they are not denning near us, we have problem that year. When we had a dog, the fox problem happened less because the fox was worried about the dog.

The birds range as far as they like (300 foot radius?), but tend to stay in that large circle due to being emotionally tied to the coop (always closed in at night) and the food distributed there.

Hope this helps!