If it's late season and I am still hunting for a bird and the hunting is tough. I quit calling all together. I use a blind in areas where birds like to gather/ feed etc.. I'll set a blind in a good turkey area with fresh sign and hunt 5-6 hrs at a time..sometimes all day.
When the going get's tough, this method has always produced me a bird. I enjoy calling birds in gobbling right off the roost, but when it comes to eating my tag in late season, hunting wary birds, the blind method is killer, if you have the patience.