When you start lowering the frequency and going further, you can have a path loss exponent of up to 4, so you have to be wary of reflections from the atmosphere

When you start lowering the frequency and going further, you can have a path loss exponent of up to 4, so you have to be wary of reflections from the atmosphere. [1] Radio engineering is really interesting. [1] https://en.wikipedia.org/wiki/Path_loss#Loss_exponent https://en.wikipedia.org/wiki/Path_loss#Loss_exponent