Make sure the wind is blowing out into the field. You don't want your scent to blow back into the woods at all, or they may never show. Usually there's enough time for them to present a shot before they are downwind in the field. If you don't know where they're coming out, pick the best tree near the best trail and observe from there...it's a bonus if you also have a clear shot down into the woods, just make sure you aren't skylined if they look up at you from inside the woods. If you observe them coming out into the field somewhere else, keep in mind which direction they move, and try to set up ahead of them next time.
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