Calling and decoys aren't going to hurt. But I think that you can ambush them. You might try a chicken in a cage while you are waiting.
Wind direction is key but not set in stone. Specially since you are a part of the farm. You could also try coyote sounds, if they hear another yote in their grocery store they should come.
Any questions can be answered here.
Navin R. Johnson: "He hates these cans!!!! Stay away from the cans!!!!"