I don't have just a ton to add to what has already been said, other than to say you could do a lot worse than to listen to what a few guys on here have to say on this subject, namely Seth Skinner(SkinnerPredatorHunter), T.J.Shockler(T.J.Shockler) and Bob in Natalia(forgot his screen name here). All 3 of these guys have killed more coyotes than Parvo and are a wealth of knowledge on the subject.
Here is what I have to add.
I disagree with the idea of setting up with the wind in your face. Often and more times than not, a coyote will circle down wind of your distress source, if you are facing upwind you will get back doored alot and miss opportunities you didn't know you had. I prefer to set up with the wind at my back or with a cross wind coming from my right shoulder as I am right handed and can swing to my left easier than my right. I think it is sometimes beneficial to have a buddy with you so you have a 360 degree field of view. Also, when it is possible, set up so that the sun is at your back, this makes your profile harder to pick up from a down wind coyote.
Point number 2. Hand calls don't run low on batteries, ask me how I know. I love my Foxpro and it goes with me on every stand and is used ALOT!!!! But what are you going to do when you get set up and find you got no juice? In short, buy some good hand calls and practice with them. If I can recommend a good call maker, PM T.J.Shockler and talk to him. T.J. makes some of the best sounding, easy to blow calls I have ever had the pleasure to use....can't say enough good about the man either.
Build you a little kit that is Predator set up, something like this.
Believe it or not, everything that you see there other than firearms fits in my back pack. Bob,T.J.,Seth and myself(lastly) have alot of experience in calling and killing coyotes, and I think I can speak for myself and the mentioned above when I say "We would be happy to field any questions on the subject"
Take care
Chupa