Hate to break it to you but it probably wasnt the blind. You still have to be super quiet and still even when in the blind. Im guess that they heard or saw you. Try setting up the decoys closer and make sure the decoys are not facing the blind or the turkeys will be inclined to look at what your decoys are looking at. Hope that makes sense. I set my blind up in the middle of an open field and the turkeys dont notice it so that is why I think that they saw or heard you.