hey voodoo like glowball say's have your buddy behind calling. and if you have access to another person you is good at calling have both of them calling behind you. it will make the bull think there are more than one cow. my hunting partners and i have found this to work very very well for us. The main thing is dont over use your calls. and be very very quiet and still because we have had bulls come in to us without even making a sound. and before you know it there's a bull in front of you. like glowball said the diaphram call is the best.