Mouth call or electronic call? Foxpro has great calls, both mouth and electronic calls. The Skyote and pied piper are great mouth calls(20$ each) A buddy of mine has a foxpro spitfire(200$) electronic call and he kills 3-7 coyotes every week using it, also a few bobcats. The wildfire II is a great call which is an upgraded spitfire for the same price. I just ordered the foxpro hellfire(350$) which is for more open country. If you want it easy and somewhat cheap, get the wildfire II which is a "beginer" call. But if you want something that is a "pro" model get the hellfire, fury 2(500$) or firestorm(400$). If you buy one from cabelas the wildfire II comes with 35 sounds chosen from foxpro, the hellfire comes with 75 sounds picked from foxpro. If you want more info on the calls go to foxpros website. If you order from their sight then you can pick your own sounds.
When you the call try to make no movement at all, coyotes can see you move your arm from a mile away. Also set your call about 60 yards out, if your in the open. Always be able to see your call. Sit in front of a bush. A decoy such as the Mojo Critter is a great way to keep the predators attention away from you. Call at a stand from 20-30 minutes. Have your rifle and a shotgun(for close range) with 00 buckshot or #4 buckshot. And when youre callimg predators will literally pop out of nowhere.
I hope I helped a little and Goodluck! If you need anymore questions answered just ask me.