i believe that there are rules, or normal behavior patterns, if you will, that determine a coyotes actions. however these patterns are much too complex to understand how any given coyote will respond. much depends upon each coyotes social, or pack position. the list of things thst might determine a coyotes responce to calling is probably endless. weather, crop conditions, hunting pressure, the presence of other predator species, vehicular traffic, etc. still, i set up to watch the covered approaches. i try to set up at or below the elevation of where i'm calling towards. everyone would always like to have the wind in his face and the sun at his back. it's a game of odds and we all try to tip the scales a little bit.
i'm fortunate to live in an area that's open enough that i can frequently spot coyotes before i ever get out of the truck to call. this opportunity has given me the best part of my education in calling. still, i can't wait to see a coyote every time before i set up. i have to make lot's of setups to connect. and that is the best advice that i can give anyone. and stay alert to the coyote thats responding in a manner thats outside of your expectations. there'll be plenty of those.