[Retric]

https://en.wikipedia.org/wiki/Disturbing_the_peace

This can include creating loud noise

Of note: A violation of a noise ordinance is in most jurisdictions not considered a disturbance of the peace unless the perpetrator has disregarded an affirmative request that he or she reduce the noise to a reasonable level. However, that would be implied in the air raid siren case.

Anyway, I agree it's not the 4th that's the issue. But, it's still unlawful conduct.

[sliverstorm]

Ok, maybe no air raid sirens. But you could talk over them, which is a bit more analogous to what was done here :)

[Retric]

Talking over each other would be the same as running two or ten routers on the same channel, which is not an issue. This approach actively prevents communication.

[sliverstorm]

So... more like pressing the "hang-up" button while they talk on their phone, or pulling the plug on their loudspeaker?