You must weigh your risk tolerance with the contents of your wallet. We all hate to loose chickens to a predator. My balancing act: Birds are shut in every night. We added an auto pop door on a timer last summer to help with that. I free range when hawks are not circling, and when we are not trying to start new lawn to repair grub/chicken damage. When either of those 2 issues come into play, birds are shut in 500 s.f. run: chicken wire, buried skirt, bird netting over top. No way could I afford to do hdw. cloth to cover this large area. Netting also must come down during our 6 month snow season. I won't try to pretend that this set up won't keep out a serious predator. Thankfully, most predation occurs from above or at night.
To improve safety when birds are free ranging: I have plenty of cover options, natural and man made. The area between the chicken run and my back deck where they like to hang out during the heat of the day is purposefully cluttered: Wheel barrows, lawn chair, step ladder and the like are scattered around. Thankfully, I don't live in a neighborhood that is "upscale". Granted, the clutter looks a bit trashy, but my girls are just a tad more secure as they dart from the run to their refuge under the deck. As an added "predator deterrent, I toss dog poo into the weedy areas between lawn and woods. I like to think that strong scent of dog will discourage some predators from visiting.
There is also electric fencing. I have the equipment to do so, but have not b/c of the added work of maintaining weed control over this area.