put the speaker in front of you as far as the cord will allow. face speaker the direction you think the coyotes are. sit in front of a bush, tree, fence post, farm equip or other to break up you outline. start a sound, go to full volume, put the controller down and just let it play.
sit still, still, still. move head and eyes slowly to scan side to side. kill them when they come. if they dont come after about 15 to 20 minutes go to different spot and do it all over again. good luck.