Houdini,
I have taken turkeys both with a blind and without. Without the blind, I generally set up off of a food plot or field at least 5 yards into the shadows or in thickest cover that still allows for several shooting lanes. I position my decoys down one of the shooting lanes (usually not directly in front of me) that will allow me to draw with cover as they cross into a shooting lane. This also keeps the gobbler focused on the decoys and not me. That setup is not always successful as the birds often do not cooperate as you well know,but I have scored twice that way.
WK