The more bucks around the better the ratteling will be. But you know they are territorial so a buck will come and investigate the ruckas to see what others are in his area. There is like a week that ratteling works really good during the rut. Play with it and you will figure out when that is. For me it is whenI first start seeing bigger bucks chase does. They are primed for a fight then. To answer your ? though, yes the more the better.