Originally Posted By: Alex

But in the woods the long (low pitch) sound waves will be muffled by the dense trees and vegetation immediately even if you have the line of sight with the listener. The high pitch sound, in opposite, will go through much farther. It's also reflects from the natural surfaces much better.


Interesting. I hadn't thought of that. I live in the desert south west where there is very little vegetation to absorb sounds. A low frequency sound signaler like an air horn may come be more suited to me than someone in the forest. But if I had to choose a mouth powered air horn or a whistle I'd probably go with the whistle only because it can be used in more places and it is smaller.