Most cagers can't see. They are blind to motorcycles. What makes us think they can hear any betterer? No, my horn in not stock. I really only use it for yota purposes and for after the fact, I'll on occasion use it to get the cager to look my way for middle finger purposes. The best horn is actually the act of rolling off the throttle and being prepared for the cager’s erractic behavior.
Moral? Your horn does not emanate a force field.