Line of Sight: Visual demonstration

Jan 03, 2017

In short, the antenna must "see" the source of the signal, be it an aircraft for ADS-B, an Inmarsat satellite for Outernet, or weather satellites.
It's easier to visualize the concept, that's what you see:



Just like you, the antenna can not see behind a house, and trees will also weaken the signal. This matters little with strong ADS-B signals, and can matter a lot with space-based signals.
At best, the area surrounded by red represents unobstructed line of sight:







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