I shot a coyote last year that was straight downwind of me at less than 30 yards. She stood broadside and watched me ease the gun to my shoulder and shoot. Did the same thing to one this year at about 50 yards. She came trotting right up to FOUR of us with the wind in her favor. Ya think they didn't smell me/us? I think my Zest and "Truck Cab" cover scent must have been working overtime! BS, of course they smelled us. Sometimes they just don't CARE! It's not the fancy cover scent or any crap like that, they don't care or it doesn't bother them. These creatures have relied upon their noses to find food and avoid danger for millions of years. That much fine-tuned evolutionary genius is way more than a match for whatever we can dream up in a lab somewhere or roll around in on the way to the stand. Drug dogs can smell cocaine when it's wrapped in plastic and submerged in gasoline for crying out loud. If a coyote gets downwind of you, it WILL smell you, that's that. The question is - what will it do when it does? Run or keep coming? Stop to smell the human, or bail out at mach 3? When you can answer that, you'll be way ahead in this game. In the meantime, just set up with the wind in your favor and watch your six and be comforatable in the fact that you can't predict a coyote's behavior and every once in a while you will lose one. Oh yeah, have fun doing it... 'Nuf said.