Calling and baiting aren't one in the same. If you're going to bait, you will need a lot of what ever you choice to use and steady supply of it to keep the coyotes coming back for more.
If you're going to call them, don't plan on carrying bair around, because it ain't going to help.
And #68 nailed it, a decoy won't usually help bring a coyote that otherwise wasn't going to come to just calling, but it will pull the attention away from your position allowing you to move around more without being noticed. Too many guys buy a decoy expecting it to bring the critters on the run when if they'd learn to call better, they'd learn the decoy is the last piece of equipment needed to be successful at killing predators.