Vince, I would like to know more about your use of sardines. A scent cover up and attractant?
The sardines is a very heavy scent, so it puts more parts per million than your scent. I have seen coyotes stop, stick their nose in the air, and they looked like they were drinking in the scent.
Sardines is an old trappers attractant. Attractants are called lures in some states and are not legal, so know your regulations.
We always set up to where we can see down wind. I carry a little alegator clip in my shirt pocket with 2 feet of black thread on it. I stick this on a bush and watch the down wind scent cone. Two cans of sardines in a dark sock, two socks hunt on either side of you, 10 yards away will be pay dirt for you. We put the socks in a Glad Loc freezer bag, then put that freezer bag in a Coffee can with a lid. Freeze the whole can, thaw out of a hunt on another day.
It also helps to buy some rabbit urine, have a small spray bottle. As you sit down to start calling, spray the rabbit urine, it will be a true direction finder. If you have a coyote hang up on you, you know if you use the "spritzer" that the scent cone will carry 250 yards in a few minutes, so get ready.
Look with your eyes going back and forth, not turning your head, the coyote's brain is made to pick up the slightest movement. If you happen to look over and see a coyote standing looking right at you, very carefully raise your gun, slowly, aim and shoot quick. With camo net over your head, camo gloves, camo gun, the coyote will be trying to figure out what you are, since he has not smelled you. The sardine and rabbit urine has his brain confused, but not for long. They may charge off or right at you. Be careful of your tracks if you filled up with gasoline at the gas station, they can smell your track for 10 yards at least.
Once you kill one, start the stand all over again. Do not stand up, watch and expect multiples since they run in family units. Blow a wounded pup call if you have one,and be ready!
If you see a coyote coming in from a direction where he will come across your track, try and stop him for a shot before he gets to your tracks. I and parts have sprayed our boot bottoms with rabbit urine and made a drag from a stock soaked with rabbit urine or sardine oil.
We have spooked quite a few coyotes with Fox urine, makes you wonder what kind of urine was in the ebottle.
Hunt on the leading edge of a low pressure front and during a lot pressure front. Within a few hours of a low pressure front passing can be very good, but it will pass fast as the high pressure rolls in. High pressure or rising barometric pressure make the parts per million much less, so the predators do not smell as well.
During a high pressure front, scout, do not call...all you are doing is educating the coyotes. Scout, mark areas on your map, get permission from new land owners.
Watch the sunlar tables with the Major and Minor feeding periods that correspond to the Moon phase. This is basic hunting, nothing new. Those Major and Minor feeding periods in combo with watching the barometric pressure are huge when it comes to knowing how animals move. Field and Stream used to publish the Solar table with the Major and Minor feeding periods, it is something to live by.
One last thing, Coyotes have a language. If you learn how to use a Dominant male howler, female/juvinile howler, locator call, Interrogation call, and Challenge howl, you take away all advantages that a coyote has. A coyote has no defense from howls as they are talking to each other all the time. The very best luck we have had when hunting during a High pressure system is with howling, for those that have never seen it, howling is a step above the best hand distress calls and electronic calls. Two guys howling is a shore nuff game changer. We have had three guys in our group howling a group howl, then we challenge howl, then sound like a wounded coyote in a fight. Dominant male and females come in charging to see who is in their territory, hair standing straight up on their back. I have shot several that would not come all the way in, but stand off in a challenge howl trying to get up their courage. It is very rewarding to kill a coyote in mid howl!!!
Best of luck to you Predator Hunters, take a youngster with you if you can.