That's a tough loss to take, Don. There's not really any way to wipe out the coyotes. Just keep trying to fence them out. I have an electric wire about 4" to 6" off the ground around my chicken yard and I've seen coyotes running back and forth wanting in, but scared to get close to the fence. My system is grounded to the fence and to the ground. The big problem with the electric fence that low is if it rains, weeds can grow fast enough to ground it, or a rabbit or something will die in it and ground it. As much fence line as you have, you'd have to run it regular to make sure the fence stays working, but it's faster and cheaper than burying wire.