When in doubt, spread your decoys out.
"I have used everything from 'shoveled-dirt' decoys to mounted birds. They all work! But they all work better when you spread the decoys out. I constantly see guys put decoys practically on top of each other and watch the birds hover and not finish because there wasn't enough room to land. Even small Canada geese have a four-foot wingspan; big birds up to six feet. I've never seen geese get tangled on takeoff or landing, and I often watch geese landing with geese. That is, they are landing inside a group of geese, not in a large opening between groups. So, logically speaking, there is enough space between birds. Ten years ago, I started spreading my decoys two large steps apart, approximately six feet. That immediately produced dramatically better results. Today I put my decoys five large steps apart and the results are even better."
—Sean Mann, Trappe, Maryland