I've used that sound the last two weekends to try to get some video of coyotes and it drew the whole family in.The female with her pups would approach to about 125-150 yards while the male would approach to about 75 yards, maybe a little closer but i just couldn't see him since the woods are so thick right now.The female and her pups would just go crazy yipping barking and howling,while the male would only howl once or twice and then he would come in,he was so close the one time that i could hear him walking around in the dry leaves but just couldn't see him.Well at least i got their vocalizations on tape.