Which option is NOT a ground wave component?

Which option is NOT a ground wave component?

• A. Sky Wave
• B. Direct Wave
• C. Ground Reflected Wave
• D. Surface Wave

Answer: (A)

Propagation along the Earth's surface is how ground-wave components are defined. This includes energy that crawls as a surface wave, energy that travels and then reflects off the ground (ground-reflected), and the direct ray that stays in the near-ground region without relying on the ionosphere. The path that is not a ground-wave component is the one that goes upward to the ionosphere, bounces off it, and returns to Earth at a distant point—the sky wave. Because it uses ionospheric reflection rather than the ground, it isn’t categorized with ground-wave components. This distinction helps explain why sky wave enables long-range reception beyond line-of-sight, while ground-wave components dominate near the transmitter at lower frequencies.

Propagation along the Earth's surface is how ground-wave components are defined. This includes energy that crawls as a surface wave, energy that travels and then reflects off the ground (ground-reflected), and the direct ray that stays in the near-ground region without relying on the ionosphere. The path that is not a ground-wave component is the one that goes upward to the ionosphere, bounces off it, and returns to Earth at a distant point—the sky wave. Because it uses ionospheric reflection rather than the ground, it isn’t categorized with ground-wave components. This distinction helps explain why sky wave enables long-range reception beyond line-of-sight, while ground-wave components dominate near the transmitter at lower frequencies.