Back when I lived in the midwest I ran coyote hounds. I have seen them clear a 48" woven wire fence with an easy jump. Of course this was with dogs after them. I had an 80 acre training pen with coyotes in it that I used to start my pups. The fence was 9' tall. To keep the coyotes in we had an electric wire at the base ( to keep them from digging out) and another hot wire 5' up the fence to keep them from climbing out. They will grab wire with their mouth and climb up. I once put one in a wire corn crib over night. In the morning he was clear at the top (16 to 20') and not coming down. That was a rodeo we should have videoed.
My point is if they want to come to that call they will. Especially if you have a couple young ones that get to racing to the call.
One other thing. You described hearing sveral yotes. Having had 30 at a time in the training pen we have spent lots of time with them. 2 or 3 yotes doing their yipping and howling ritual will sound like a dozen. It is amazing the serenade 3 yotes will put out.