Comment by userbinator

My first thought was atmospheric effects, i.e. along the lines of "The radio only works at night": https://en.wikipedia.org/wiki/Clear-channel_station

Also worth reading: https://en.wikipedia.org/wiki/Sporadic_E_propagation

I must say, the AI-generated "stock image" doesn't add that much to the article and could be done without, especially when its alt-text contains the prompt.