How far is carried by the drum sound signal? At Stanley Falls on the Congo some time ago I was a drum, whose fight some people can hear and understand in Yakote - twenty miles (more than thirty-two kilometers) downstream. I think that this rare drum set a record for Africa. Of course, only the water could help to ensure that the sound overcame that distance, for some types of terrain, on the contrary, weaken the drum voice. Five miles day and seven at night - it's probably an average range of signal drums. Hot air carries the sound up, rather than spread them outwards so the drummer, referring to students who are away, should send his message at dawn or at night.