Coyote trouble

Chickens hiding eggs has taken second priority to keeping chickens alive. We have lost 6 chickens in the last 3 days to coyotes. They are patrolling the field and attacking chickens that have escaped and are roaming outside of the fence. Every chicken lost has been in broad daylight and we return home to feathers scattered around the field. So far they have not broken in the fenced in area, but it is only a matter of time before they become desperate to get at the chickens smart enough to stay in the enclosed area. Our plan of attack is to send Vince out in hunting gear in the early morning and late evening. Our more permanent plan of defense is to build totally enclosed runs attached to the coop and move them more often than we move the current fences. Here is a picture of the feathers left of one chicken...