Try setting your decoys in 2 groups. One to the left, one to the right and leave some space between them to act as a landing zone. This is a pretty versital spread and can be adjusted depending on the wind. For example, if you are forced to hunt a cross wind that is blowing right to left, make the group on the right larger than the group on the left to pull the birds all the way across the blind. Of course a wind blowing at your back is always preferable, but not always possible.