What can significantly reduce the signal of a space wave at the receiving site?

The significant reduction of a space wave signal at the receiving site is primarily affected by ground-wave reflections. When a space wave travels from the transmitter to the receiver, it is usually affected by various environmental factors. Ground-wave reflections occur when the signal interacts with the ground, leading to constructive or destructive interference. This interference can directly impact the strength and quality of the signal that ultimately reaches the receiver.

Ground-wave reflections can cause the original signal to be weakened or altered as it combines with reflected waves. If the reflected signal arrives out of phase with the direct wave, it can lead to cancellation, resulting in a noticeable drop in signal strength. Understanding this phenomenon is crucial for predicting and optimizing communication performance, especially in environments where the signal travels over large distances or diverse terrains.