A wonderful site showing a few different types of radio signal **refraction**. Important to note what you are seeing here is totally different from the effects you get from HF radio frequencies and occurs with VHF and UHF as well. Its why generally line-of-sight frequencies like UHF can sometimes go some ways over the horizon.




@freemo @Science

I produce exactly the same types of diagrams for sound waves & rays in atmospheric layers.

Navy acoustics experts also do this for different layers of seawater so that submarines can hide from each other and from ships

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