What was the significance of the transatlantic transmission in December 1901?

Answer

It proved that waves could propagate along the ionosphere, defying straight-line propagation beliefs.

The transmission proved that radio waves could travel a distance suggesting they were bending or propagating along the ionosphere, which contradicted the contemporary belief that waves traveled strictly in straight lines.

What was the significance of the transatlantic transmission in December 1901?
inventorcommunicationradiowirelessMarconi