AAAudio

AAAudio is at 5 in a listing of 9. Read the rank as a rough position rather than a standing: the click counts in the middle of a long national list are close enough together that a handful of opens moves a station several places.

English from Luxembourg, one of only two such entries the directory holds for the country. The national listing leads with Luxembourgish, which is what makes this worth pointing at.

Where else English is on air, according to the same snapshot: mostly United States, United Arab Emirates and United Kingdom. The shelf lists all 5,984 of them together, which is the view a country hub cannot give.

Nothing else in Luxembourg's listing leads with ambient. The tag is self-declared, which makes it a statement of how the broadcaster positions itself rather than a classification anyone audited, and on this dial that statement is unique.

The gap here is large: 128 kbps where Luxembourg's stations typically run 256. Rates at this level were designed for dial-up and for mobile data that was billed by the megabyte, and plenty of stations simply never changed the setting.

Its audio comes straight from rocket.streamradio.fr:8008, an address unique to this entry in Luxembourg's listing. That is the simplest case there is, and it is the one where pressing play tells you the whole truth about whether the station is on air.