If you cant see them you cant shoot them , Elevation------ or like Kain said small shooting lanes inside covered areas .I use this tactic a lot in heavy sage .
coyotes that have cover available will never expose themselves to a open area if they see no reason , the only other alternative you have would be a decoy to draw them out to open ground .
a lot of guys use a ladder for elevation , but i suggest you practice with it before using it in the field , it can be dangerous.