i love hunting this method (it works best if you invest in a coyote decoy). find an area where you're almost positive they're close. set up your dripper UPWIND from where you believe they are (along with the decoy if you have one). walk either direction away but make sure you aren't going further upwind or else they'll be able to smell you too. dont make ANY calling except maybe a little bit of howling or barking, and wait for them to catch a smell of the coyote piss and come check out who's in their territory. blast em.

if you want the best scent around, get real coyote piss. this can be free too. just empty the bladder from other coyotes you've killed and save the piss in a bottle. works best, just don't spray it on yourself as a cover scent lol