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The troposphere... It acts like a gigantic mirror - reflecting radio waves back to Earth.
To be specific, its ionosphere. It is one of the layers above the earth's atmosphere consisting of ions of gases. Radio signals are reflected back to the earth from this very layer.
From what I have researched, the answer to that is the Ionosphere-upper mesosphere/ lower thermosphere, though I do not know if that is 100% correct.
It is what radio waves bounce off of.
telstar
Exosphere (Thermosphere).
Ionosphere
the lonosphere
Lonosphere
Ionosphere
The Ionosphere
Ionosphere.
the ionosphere.
the lonosphere
The ozone layer contains electrical charged particles that reflects radio waves
The ionosphere - specifically the e-layer
I believe it is the Ionosphere.