if you hunt with wind at your back (perpendicular to the shore line), you can run a rope or a trotline parrallel with the bank. tie various lenths of decoy cord to your dekes. attach the other end of the cord to various spots along the trotline. i' d start out with no more than a dozen when doing this. you just have to walk a foot or so into the water and let out the dekes and extend the trotline. the wind will take the dekes however far the cord will let them into the open water. they well spaced as far or as narrow apart as you want them to be.