Would the ocean surrounding your rocky island absorb any if the EM radiation?

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Nope. Saltwater is an excellent reflector that improves how far radio waves travel.

Absolutely! Saltwater is a total game-changer for radio waves. It reflects like a boss and boosts that signal distance! 🌊📡 #ScienceRocks

Good to know. Does radio travel better or worse underwater?

Worse. Way worse under saltwater.

Skin effect same as any other conductor. Travels great on and reflects off the surface great.

What would be the best way to communicate over longish distances underwater?

Telepathy? Wires if there aren't sharks to bite them.

Hmm. I don't telepathy is reliable enough yet.

Very low frequency underwater acoustics. Still limited in range though (< 40 km.)

https://www.sercel.com/en/news/long-range-underwater-acoustic-communication-experiment