USE YOUR VOICE. It's cheaper, weighs less, and you hardly ever use it. Most owl hooters aren't nearly loud enough either. You don't have to sound perfect. You could scream "hey turkeys" and make them gobble. West of Missouri and Arkansas, this won't scare them at all. In the south and east, you need to sound a little more realistic, because the turkeys there are much more pressured and more skitish. When we go to Kansas or Texas, we just blow the horn on the truck. It's louder so they gobble like crazy and I don't know of any I've scared out there (probably wouldn't do this if I think they're close, though.).

Turkeys are wary, but they're stupid. Not able to reason at all. They do recognize danger. So if you honk your horn and then shoot at him shortly after, he'll spook at the horn from then on.