xkcd #3307: Spectrum Allocation
Title text:
Rumor has it that they’re finally auctioning off the zeppelin navigation bands, but everyone is worried that the scary boat captains will express interest.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3307/
What if aliens don’t want to broadcast on the Hydrogen Line? They’ll likely try Methane if they are truly into the butt stuff.
That’s what “weather balloons” (including the quote marks) is for. I believe it’s a reference to the official story on the Roswell incident.