I generally run about 1 senty or active for 8-10 feeders. If you watch geese when they are not bothered in a field, most will be feeding. When you run that many feeders/actives, it looks like they are spooked and ready for flight. Check out Goose Society, Goose Society II, and The Science of Hanging "Em Low from Molt Gear and Lynch Mob respectively. They really put a lot of "how to" into goose hunting. Both are great videos! I like the Lynch Mob a little better because of the message he relays about what it means to be a hunter (not a killer)... Both Lynch and Threinen are amazing hunters. I give part of the credit to where they live since they have tons of birds, but that also means lots of hunting pressure, so they still have my respect! Both of these guys really show good decoy placement strategies and how, when, and why to use certain kinds of decoy spreads. Both are hugely in favor of using mostly feeders with a few sentries mixed in. After watching these videos, I started watching live geese more closely and agree with them that most birds are feeding unless spooked (in a field situation)... I hope this helps you out! Good luck!!!