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Why doesn my 802.11 WiFi or cellular phone radio signal travel around the world?

April 26, 2017Cellular phone radio signal Travel wifi world

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Why doesn my 802.11 WiFi or cellular phone radio signal travel around the world?

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802.11 WiFi uses 2.4 Ghz frequencies (2400 Mhz) which is considered microwave frequencies, cellular is 800 Mhz, and PCS is around 1.3 Ghz. These to not bounce off of the ionosphere, but travel right through it. The reflective characteristics of the ionosphere diminish above about 30 Mhz. Also, microwave frequencies are much more susceptible to absorption by precipitation and water vapor.