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You guys are reaching. Unowns are a reference to aliens and the conspiracy theories of how human culture was supposedly built by/inspired by aliens. Like how the pyramids of Egypt have writings on the walls and are kind of like mazes on the inside or how some people claim that there is a spacesuit depicted on the Nazca Lines.
Even the name hints at this: Ruins of Alph since alpha is usually used to mean "the first" or "the primordial." This is also were the language supposedly comes from.
The whole radio transmission is because there are supposed electromagnetic interferences in those areas, as well as most of those weird "alien sites."
Japanese love the concept of ooparts and aliens and shit. It also fits with the Pokémon world because:
>it is believed Clefairy, and most Pokémon, actually come from outer space
>Star Pieces, Star Dust, Comet Shards, etc. Are literally pieces from stars and comets
>it is heavily implied evolutionary stones come from meteorites
>Porygon was made to explore space, Porygon 2 is an upgrade
>later generations introduce another Unown ruins and alien-like Pokémon
Also the Ruins are not in the same place as Hiroshima or Nagasaki are.
>b-b-b-b-b-but they're near!
And? They most likely avoided any direct references to that and didn't include those sites at all, just like there isn't any 911 references in Unova.