The signal would be too weak. See free space propagation https://en.wikipedia.org/wiki/Radio_propagation#Free_space_propagation https://en.wikipedia.org/wiki/Ra

The signal would be too weak. See free space propagation https://en.wikipedia.org/wiki/Radio_propagation#Free_space_propagation https://en.wikipedia.org/wiki/Radio_propagation#Free_space_p.... Remember, we are already using super sensitive telescopes for looking at the star nearby the exoplanets.