When it comes to mouth blown calls I have several I use, some home made, some custom calls made by THO; I've had good results with all of them.
That being said, when I go out predator calling there's two I never leave the house without them in my pocket. They are my "Little Buddies" predator calls, they don't look like much but they sure call in the coyotes.
Regards
Bob Hunter
www.huntercustoms.com