Most dairy, pig, chicken , etc farms usually have a "dead pile" where they take all their dead Carcuses. If you have the time to put in, it's a good place to just sit and watch if you know the coyotes are hitting it. I have a pig farm with a dead pile. I have seen lots of tracks but never called in a single fox or coyote. I guess my animal distress sounds just don't appeal to them when they are use to an easy meal by walking in to all the dead ones.