Line of sight means the total distance you can see is the range of the wireless detector.

• A. True
• B. Not defined
• C. False
• D. Only for line-of-sight detectors

Answer: (C)

Line-of-sight describes the unobstructed radio path between the wireless detector and its receiver, not the distance you can see with your eyes. The detector’s range is a radio range determined by factors like transmitter power, antenna gain, frequency, and the environment (walls, metal, interference). Even with a clear line-of-sight, obstacles and environmental conditions can limit how far the signal reliably travels. Conversely, signals can sometimes reach beyond a strict line-of-sight path via reflections, but performance is usually degraded. So the statement equating line-of-sight with the total visible distance is not correct.