Hi Flatshot. Seriously though, I have used a rabbit decoy with rabbit urine before. Although I have called coyotes with this set up, I can't say for sure whether the rabbit urine played any role. Personally I would think the spray bottle idea would be more effective. You would be able to disperse it over a wide area downwind of your decoy by misting the air. It would cling to the foliage downwind. I have not tried the spray bottle yet so I'm guessing here. Have read very experienced callers writings who claim it works though. The scent is commercially available from many hunting and trapping supply sources.
Good luck