Some friends and I are talking about taking up some night time varmit hunting. We've decided we'll use a calling device; wounded rabbit, etc. to get the game to hopefully 50 to 100 yds. What suggestions would you folks with some experience in this area have regarding the type or brand of callers and what sounds for coyotes, fox, and maybe a bobcat? There are all price ranges and different calls. We will not be too far from a hunter's cabin but we have no electricity other than vehicle batteries. We don't want to spend too much but we don't want to buy junk and then have to replace it. Any information would be greatly appreciated.