Once the birds get pressured they get very picky on deke spreads... we use shells or full bodies and small spreads WILL work.... that said our spread is a mix of silos, shells, and fb's....I would look at shells for starters!!!
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They're good to mix with other decoys if you want a bigger spread and want to fill it out a little bit. Plus, just a little wind and you get movement which you have to have in your spread. For crane hunting all we use is rags.
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