At last - a breakthrough on the terrestrial front!
I'm pretty sure now that the arrangement is something like: the company RBCP works with generates the "Party 934" stream, which is then voluntarily carried by a pirate station not owned by, operated by, or otherwise associated with said company.
http://www.fcc.gov/eb/FieldNotices/2003/DOC-288954A1.htmlhttp://en.wikipedia.org/wiki/Wikipedia:Articles_for_deletion/WBXO_(2nd_nomination)
http://www.wbxo.com/Since there seems to be little/no documentation regarding this "WBXO", I am left with two possible conclusions:
1) As per a quote in one of the Wikipedia deletion votes, they are a pirate running either 250W or 1kW (not likely, else a Google search would have turned up angry hams and a mention or two in NERW)
2) As per other Wikipedia comments and vague details on wbxo.com, they are a Part 15 unlicensed FM running 0.1W from a mountaintop, and might-maybe-kinda-sorta reach out for a mile or two (rather likely - I'd bet they're a "reformed pirate" that dropped their power after the FCC got too close for comfort, or perhaps a quasi-pirate running just outside the Part 15 restrictions)
So, yeah.
I'm pretty sure not one single person in the U.S. owns an HD radio though. I've never even seen them in stores. I saw one on Gizmodo.com once, but that's it. So if we're on a subchannel, that's about the equivalent of not being on the radio at all.
I actually do have an HD radio, FWIW - a Sangean HDT-1 that I got at a Goodwill auction for $30. But I don't use it as such; its sole purpose in life is to receive AM Stereo broadcasts... which is a whole 'nother story. Not much HD Radio activity 'round these parts.