When have you used a grunt tube and immediately had 5 or 6 bucks come running in to investigate? Me, NEVER!!! There is something to the "GROWL", I have not had enough time to re-search it but I believe it is going to be very powerful... Like I said a thousand times, watch the clip from the Drury Brothersby the gentleman in Wisconsin and you will be amazed, and if you can make the true "Growl" on a grunt tube I want to hear it... Check out this link... http://www.druryoutdoors.com/madbgcomm.html