Shag,
I do use a little coyote urine on my sets most of the time. I have caught coyotes with nothing more than a bedded trap in front of a small clump of grass or fescue with nothing more than a coyote turd on top, no scent or nothing. I like to change-up from time to time.
As for lures, I predominantly use Leatherwood Creeks Coyote Carnage or Mark June’s Songdog Supreme but sometimes temperatures dictate my choices there also.
Snares are good in fencerows, especially with woven wire fences where they cross under.
Concerning the dens, I don’t have an answer for that one.
I would recommend that your friend watch some Youtube videos on trapping coyotes, especially Coon Creek outdoors or Clint Locklear to name a couple. It will save him a lot of frustration. Good luck!
