Locate a gobbler's exact roosting location, and know their surrounding habitat.
Rise early, and set up in the dark, inside that bird's roost zone (under 100 yards).
Establish your position behind a natural obstruction (hillside, cover with open shooting lanes, etc.).
Use no-hands mouth diaphragms for calling. Or your own voice to yelp.
Be alert before and during that period of time when turkeys wake up, begin to roost call, fly down, and assemble.
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