[Enginerrrd]

Detecting radio signals never made much sense to me.

Even a few light years away, it’s almost infeasible to build a radio transmitter that could be detected above the noise floor. The amount of energy you’d need would be absurdly wasteful.

[msdz]

Wasteful by whose standards?

If you’re an alien civilization with several dyson spheres, surely at some point you’d have sufficient energy/resources even for such a “hopeless” science-y project, right?