Question

The omnirange signals are affected by topographical features in the immediate vicinity of the omni station, such as fences, power lines buildings, etc. This is called:

Answer 1

Radio wave interference affects an omnirange station's signals when nearby structures disrupt the transmission. A clear line of sight is needed, especially for FM, TV, and mobile signals, whereas AM waves can navigate around obstacles.

Step-by-step explanation:

The question posed refers to the effects of the environment on radio wave propagation specifically dealing with an omnirange station's signals. Objects like fences, power lines, buildings, etc., have the potential to disrupt the transmission of these signals, a problem known as radio wave interference. This phenomenon is due to the need for a clear line of sight for optimal signal transmission, particularly for frequencies such as FM, TV, and mobile communications, which are usually broadcast from tall structures to avoid obstructions. On the contrary, AM wavelengths have the capability to navigate around such obstructions, akin to how ocean waves can circumnavigate large rocks.