What consequence do reflections from tall structures have on radio signals?

Reflections from tall structures can significantly impact radio signals, primarily resulting in delays and distortions in the received signal. When radio waves encounter a tall building or similar structure, they do not just bypass it; instead, some of the signal is reflected off the surface of the structure. This reflection can cause the same signal to take multiple paths to reach the receiver—these are known as multipath effects.

As a result, when the reflected signals combine with the direct signals, they can interfere with each other. This interference may lead to constructive or destructive signal combinations, depending on the phase of the incoming waves. Such conditions can result in signal fading, echoes, and variations in quality, making it challenging to maintain a clear and consistent communication link. Hence, delays and distortions are common consequences stemming from these reflections.

The other options do not accurately reflect the nature of the impact that tall structures have on radio signals. For instance, improving direct communication or strengthening the signal would not typically be observed, as reflections tend to complicate and degrade signal clarity. Increasing effective range is also not a typical outcome, as reflections can lead to unpredictable changes in signal behavior rather than simply extending the range of clear communication.