I have good luck with an owl call, but have never got one to gobble to my crow call. I've heard them sound off when a goose flys over when I wasn't getting a response from my calls. I think it is just like any turkey calling, they gobble when they hear something they like and just because it works today doesn't mean it will work tomorrow.

Will a coyote howl used to locate a gobbler not spook him the other way when he fly's down?

In my experience Bucky "no' while in the roost!The key is how close you actually are to the bird in locating!To close and you will spook him!I use my howler when the birds are in the roost,and switch to either a goose flute or crow call after fly-down!After daybreak I dont have as much luck with a howler and it very well could be the birds relate it to danger!!