"Greece's civil aviation authority said an indeterminate "noise" impacted radio channels, but the cause was not clear.

"The 'noise' observed in the frequencies was in the form of continuous, involuntary emission," it said in a statement."

Betcha it's Russia testing jammers for shutting down EU aviation in the ramp-up to WW3. Plausibly broadcast from a warship in the Aegean.
https://mastodon.social/@campuscodi/115837118514059702