I should have pointed out that you do not spend time calling where the coyotes are not.
We try to call every land owner at least 2 days before the hunt or the day before. We ask have you seen any coyotes and a lot of times they haven't during the day but some times in the evenings or early evenings. Many will tell us they have heard them in the evening or in the early mornings though.
Some times we deviate from our mapped plan, so we will stop and run our siren locator sounds. If we hear coyotes howling we will stop and hunt the place if not we pass on by.

Al