Why are HF scatter signals usually weak?

Scatter propagation occurs when radio waves bounce off irregularities in the ionosphere or the Earth's surface, redirecting energy into areas that would otherwise receive no signal. Because the main body of the radio wave continues along its primary path, only a tiny fraction of the original radio frequency energy is deflected toward the receiving station. This explains why scatter signals are notoriously weak. Distractors involving auroral activity, F-region absorption, or ground wave absorption are incorrect because they describe signal loss or attenuation mechanisms for other specific types of propagation, not the fundamental geometric reality of scatter.