We use 2 dozen bigfoots, approximately 8 dozen shells (a mix of magnums and super magnums), 2 dozen outlaw silos, 3 kites, 3 wind socks on elevated poles, and flags (at times). We've had pretty good success simply relying on the bigfoots and a couple dozen shells on late season birds. We've also found that throwing in some field mallards and a mojo mallard really helps. We even throw a few moving bases on some of the bigfoots. Flocking the heads also helps. More realism and more movement in the spread is just as important as the number of decoys.