I don't think a yard covered with feathers is an attractant to coyotes or foxes. What draws a coyote's attention to a feather in the wild is the feather is something unusual, out of place and coyotes are curious. They also will see a feather and assume there might be something left of the previous owner. Coyotes that frequent areas with humans are not all that difficult to trap. It won't be as critical to cover your scent.
I think snares are best. They are very inexpensive and very effective. Unlike foot traps, all you need to do is find a likely approach path and set up your snares. Whereas, with a foot trap you must place your "set" so that the coyote must put his foot directly in the center of the trap. There are dozens of videos on youtube for snaring coyotes and for trapping coyotes. Watch some, pay close attention, try different techniques and you will soon be proficient. Techniques for trapping foxes will work equally well on coyotes. Just use heavier traps/snares. You can place dozens of snares for the price you'd pay for only a few traps.
One of the easiest ways to snare a coyote is if you can find a place where he is crawling under a fence. Also, if you have a good idea of his approach path, you can funnel them into your snare or trap by placing brush, logs or debris in place to direct him right where you want him. I'm not a masochist. I don't get pleasure out of being inhumane in dispatching any animal. But how humane is it for your stock to be eaten alive? Because it's a coyote committing the "inhumanity" it's OK? More compassion for the killer than for the animals you have raised since birth/hatching.
This relatively new concern over wild killers treatment boggles my mind. We have come to the point of equating the lives of a mange covered heartless killer with that of humans. We have come to equally regard the nasty coyote with the cuddly little Poofy Lou the Shitzou! In the 165,00 years of mankind, it was always absolutely natural for man to defend himself and his livelihood with the utmost violence against predators. It has taken this politically correct, clueless generation less than 75 years to try and change the natural inclination of man to protect his stock.
There are those out there who tell us to go easy on the predator because they are only doing what comes natural to them. It's embedded in their DNA. It is for precisely this reason I kill them! It is also embedded in my DNA to protect me and mine! Killing a predator is 100% effective. He can't possibly kill again. They say "More will come" I say "kill them also". Math and science folks.
Math; One less killer is ONE LESS!
Science; A dead predator can't kill anymore!