My brother read an ariticle in Outdoor Life and the author used an air horn to call in coyotes. I don't know if I was targeting them I'd try it, I think I would use a rabbit dying instead, but if that didn't work I'd try it.
If they ever do have timberwolf tags available, I guess a coyote howl works awesome. I guess the timber will come running if they hear a coyote. They use it in Canada quite a bit.