What is a major characteristic of bouncing radio signals?

Bouncing radio signals, also known as refraction or reflection depending on the context, significantly increase the range of communications. This phenomenon occurs when radio waves encounter a reflective surface, such as the ionosphere or large buildings, allowing signals to be redirected over long distances. This characteristic is particularly useful for long-range communications where direct line-of-sight transmission is not feasible.

Higher frequencies may have different propagation behaviors, and while they can bounce under certain conditions, it's the ability of bouncing signals to extend range that is particularly noteworthy. Additionally, the assertion that bouncing signals can only be utilized in urban areas is inaccurate, as such signals can be effective in various terrains. Lastly, the limitation of frequencies below 1 MHz does not apply to bouncing signals; in fact, a wide range of frequencies can utilize this phenomenon, including those well above 1 MHz. Thus, the option indicating that bouncing radio signals increase communication range captures their primary advantage accurately.