[doc30]

Does anyone know what the radio frequencies from Earth would "look like" if someone was in another star system doing the same, SETI-like experiment?

[RadioAstronomer]

Does anyone know what the radio frequencies from Earth would "look like" if someone was in another star system doing the same, SETI-like experiment?

They would see our narrowband carriers. :-)

[Robert A Cook PE]

OK.

So, if/when 90% of "radio" messages now carried are on satellite TO earth (not in the energy-wasting earth-to-universe broadcast direction), or are carried underground through optic cables, or are on high-freq/low propagation bands, how much of OUR energy could be picked up?

We've only had radio waves going (at high power) since the early navy radios of the 1920's, and that covers 80 years out of 12,000,000,000.

In another 20 years, very little wasted energy will be sent into space.