You will need to leave the blind set up in the same spot for a long period of time for coyotes to addapt to it, or blend it in with the surrounding vegetation. We've tried to call coyotes to the blind with it set up in an open field, while turkey hunting, and all the coyotes we've called kept thier distance. Although, I think all of them could've been shot with a rifle, but none of them got with-in bow range. The coyotes acted much like deer do to the blind that is in the open field set-up.
The use of an Ecaller of some kind would help to get the sound and thier attention away from the blind.