Len, I mostly use mouth calls such as the TallyHo, Red Desert Howler, Thumper, Tweety, and some Sceery calls. It seems the cottontail in distress works best for me in this area. I have better luck with my electronic caller at night. Good luck and have fun.
Len, I'll second Jack rabbit and cottontail. Many calls will work try them all.
I deer and lope hunted the area north west of New Castle. The night I shot my deer I was waiting in the dark for my friends to pick me up, only about 1/2 a moon was showing. About five coyotes lit up within a half a mile. I had the fox-pro in my pack and set it out by a post for reference and backed up 30 yards. Turned it on the Jack and all those yotes went quiet. I think the first one was on me in about 90 seconds. Things went downhill from there...
Matt Salm and I are putting together a stategic plan for the Len Backus Driftless Area Winter Coyote Tour. Scoped out some new land in Crawford County today and killed two. Saving the smart ones for you.