Pardon if this may have been discussed to death before but being a newbie here I thought I would post it up.
I have had good luck with a goose call as some have mentioned. Also right many located with a wood duck call.
Met a guy from upstate New York who guided out west for elk. Had one gobble to a bugle. Said he made a smaller version and used it with great success upstate.
I love a jake brake on a big rig too if one sounds off nearby.