i have had bucks come from 400yds away in open country to rattlin and grunt tubes. the can was unbelievable for me a few years back. the first year i had one almost every deer i saw came right in with the can. i could let them get close and wait til they wandered off and call them back 90% of the time. but in the last 2 seasons i have not had much luck useing it,i can't understand why it worked great then but not now. under the right conditions they all will work.