Here is an old article I wrote a few years ago, obviously it's about bowhunting but you get the idea. Bowhunting Blog | Bowhunting Predators: A Different "March Madness" Foxpro's are great, the ability to change sounds is priceless at times. By far the best advantage that an electronic caller offers, is the remote feature. Obviously the coyote is coming to the sound, if he's focused on something that is 30-50 yards away from you, your chances of success go up significantly. Having the decoy at the caller and being able to control both with the remote is also priceless. For hand calls I like the original Crit-R-Call, The Verminator and the predator call from Mossback game calls. Make sure you're always calling into the wind or at a crosswind if you can help it. Calling down wind basically just educates them.