Hi Songster,An electric fence is a great option for preditors, however (lol), we already have electric fencing around all of our fields for the cattle. The coyotes are a bit smarter than we are. They always manage to find their way in. The cattle and horse do a great job at keeping them away. We've only seen one or 2 slip through. They are shot and we haven't seen any in a few months, but nighttime confirms there are still plenty out there, as we can hear them. We haven't lost a chicken to them so far, but my luck...
When I worked on farms many years ago, the electric fence used for cattle and horses consisted of either 1 or 2 strands of wire and were supported on insulated posts about 3 feet off the ground. The type of electric fence I'm talking of with regard to predators is the white nylon netting that looks similar to pig or sheep netting ! When set up correctly it is extremely effective towards ground based predators.

Another option could be the use of a guard dog, my English Bulldog spends most days out in the garden with the chooks And when she is out there no cats, dogs or postmen can come near the garden without her barking furiously.