Aliens don't have FM Radios

I’m up watching a BBC program about SETI with scientists hoping to have a tete a tete with some green monsters anytime soon.
While I’m a tech buff yet I feel this may be worse than a search for an elephant with 10 legs. Aliens, if they exist, may not even have radio technologies. It may be beyond them or way below them.
Aliens may not even be carbon based life. You never know if that freaking diamond ring maybe someone’s sister cut to size. Just saying. But wait, isn’t diamond carbon?

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