If you are serious about helping with removing coyotes and you are just learning HOW to do it, a firearm may be a better choice.
The local song dogs WILL get educated very quickly. Get to know them, and you will be amazed.
I am a bowhunter to the core, but when the quarry is a `yote, I prefer a firearm.
A coyote that has responded to a call has a faster reaction time than deer. When the arrow gets to where the `yote was...he is already gone.
If they haven`t had hunting pressure, it may not be so bad, but they will figure it out quick.
Being in a tree won`t hide you from his nose. You must assume they are going to get the wind to their advantage when they come in, they live by their nose. You will be more mobile from the ground.
I have an electronic call, with a housecat in distress recording. I have found that sometimes, the `yotes can`t resist. I set up close to barns and out buildings, and have found that yotes will cross open ground to torture a lost kitten.
Coyotes with a bow...the ultimate challenge.