When I was researching what kind of fence I was going to get. I read online about a guy that bought the Premier poultry fence as a perimeter about his beehives to keep the bears out. The fence worked and he told a kinda funny story about how a bear screams when he gets into the fence. He was saying you could hear the bear for miles. That's the thing about this fence, you look at it and you are not so sure about it. But when an animal comes up to it, they always lead with their nose, to check it out. When they get zapped, they don't even want to come near it again.
I know this, it's really nice to be able to let the chickens out and not have to worry the whole time they are out. They can spend the whole day out again. I'm thinking I'm going to buy another 100 ft section and expand their run. One more thing, do you have a rifle? Shoot that fox the next time you see him/her, if you can. Goodluck
Jack