What is Line of Sight (LOS) communication?

Line of Sight (LOS) communication refers to a mode of communication that necessitates a clear and unobstructed path between the transmitter and the receiver. This means that for effective communication to occur, the two points must be able to "see" each other directly. This is crucial because physical obstructions like buildings, trees, hills, or other barriers can disrupt the signal, leading to poor or no communication.

LOS communication is commonly utilized in various fields, including radio and microwave communications, where the transmission relies on high-frequency signals that travel in straight lines. The precise alignment of the transmitter and receiver, without any barriers in between, is essential for maintaining the quality and integrity of the signal.

The other options do not accurately describe LOS communication. A communication mode that operates over any distance would not require unobstructed paths, and thus does not apply. Satellite connections involve different communication techniques that transcend the limitations of ground-based LOS. Lastly, relying on visual signals pertains more to non-verbal communication strategies rather than the technical parameters defining LOS transmissions. This focus on the requirement for a clear path makes option B the correct choice for defining Line of Sight communication.