in the morning ive never used anything or needed to use anything....i scout hard and know where the birds roost......im the crazy one....up before the sun sitting on a high point where i know birds frequent by finding their sign days before...then go in early in the mornings before the season.....they sound off naturally in the mornings....i pinpoint their roost..then listen when they fly down..which direction they go...and try to figure out where they went...i cant say ive ever used a shock call to get them to gobble on the roost or needed to....once they are on the ground i use a crow call and it works fine for me.....i dont see any reason for me to go in in the evening and listen to them fly back up.....to me that would only end up screwing myself up if id kick them out or something....some guys do that.....and do a fly UP call and let the gobbler know a hen roosted near him...go back to that exzact spot in the morning and do a fly down when he wakes up to let him know you(the hen he heard last nite) flew down and he SHOULD goto you....but i find more times then not hes already got hens in HIS tree....and flys where they fly....and unless you make them mad enough to fly in your direction they will fly where they wanna fly.....thats why scouting them in the morning is more important to me......they generally most of the time fly down and do the same thing pretty much every morning.....figure that out and it can help you set up where he already naturally wants to fly down to.....hope this helps a little....i dont know why you cant find gobblers on the roost....when its this time of the year they sound off naturally...im sure our birds are gobbling every morning already....maybe your birds are a little quiet still....i dont know when your season is....a month or so before though they should be talking on their own.....atleast they do here..and we have a little late starting season..after peak breeding......ive found hens nests the first week of the season......