@goldenoakfarm seems to have figured out how to keep them safe, and she's the real deal. I'm small time. Here's what she sent me when I asked her how she does it.
https://steempeak.com/@goldenoakfarm/psb83r
This looks like a lot, and it is, but the many links document her trials and solutions really well.

I'm having many problems this year, not only with chickens, so I took the easy way out and ordered a UFO shaped fiberglass portable coop and a run for now. I just have to find the four hours and a brawny female or fellow to help put it together. Then I think I may use something of golden oak farm's to fashion a daytime safe yard for them.

I think the fox is very beautiful. It's a special thrill when I spot it. I have mixed feelings about it eating my pets though, and I think in future it's better if I don't name and get attached to my chickens, maybe even eat them.