I wonder as the mish-mash of our history of radio and TV signals propogate through space, if it is even possible to separate and decode individual distinct transmissions.

At some distance, earth is a point, or single pixel as it were.

Frequency standards on defined wavelengths referenced to meters, maybe.

Random broadcasts of music may not be so easy.

Simple waveform detection of analog modulation, AM or FM is simple.

Analyzing the scan/retrace/interleaving/synchronous NTSC or any other TV image standard is going to be quite a challenge, as all signals would overwrite each other and make it difficult to separate anything distinctly, except maybe briefly as thrown off as "horizontal" low angle radiation at local daybreak/dusk.

Here's a signal still somewhere in space, that got caught and randomly saved.