Spectrum is finite. We're using ours more efficiently now by chopping it up into smaller and smaller sections of the Earth, and by digitally encoding, compressing, and in some cases encrypting our signal.
As a result we're sending a lot less stray analog RF out into the universe. And the stuff we are sending looks a lot more like noise.
As a result we're sending a lot less stray analog RF out into the universe. And the stuff we are sending looks a lot more like noise.