Some of the earliest radio broadcasts are Hitler's speeches, as well as other world leaders preparing their nations for global conflict. So there's that.
That would be TV broadcasts as I’m guessing everyone here seen Contact.
Ironically in 1948 when FM was standardized and countries were assigned spectrums Germany wasn’t really invited as it wasn’t a state for that short period and wasn’t assigned a spectrum so they started broadcasting in VHF because that wasn’t covered by the Copenhagen Agreement.
A few years later people realized that VHF was supper efficient for FM unlike AM and (W)Germany ended up holding all the cards.
This is why (primarily older) VHF FM radio compatible receivers in Europe will have UKW FM or UKW option in the turner which stands for Ultrakurzwelle (Ultra short wave) that was before UHF was standardized above the VHF spectrum.
Alien dad goes windsurfing with SETI daughter, but the only evidence he leaves that it's not the hoax of some rich bald dude is 18 hours of static, so the audience can have both their faith and science, but no blackhole for Matthew McConaughey.
There's a story in which aliens unexpectedly destroy nearly everything in the solar system and when asked why, they explain that they received transmissions of Star Trek episodes and people singing "We Are The World" and so they put together the fantasies of galactic domination with the idea that humans might be close to global unification, and decided it was time to apply a bug bomb to Earth.
In other words, the things we see as negative might not bother aliens much, if they mostly indicate we might destroy ourselves.