Are you talking about the spinning wing decoys that are geese. If you are, I have use the spinning wing goose decoys they work great it diffrence between night and day. I have 3 of them that I use, but you can get by with just one. As for your spread I have never really added or taking away the amount of decoys I set out just added more movement over time with the spinning wings. I started with only one when I started out