[cleeds]

Originally Posted by Clark2

I accept what you folks are telling me, but aren't you at all curious about how HD works and what specific artifacts it produces? -- Clark2

I've heard HD broadcasts more than a few times, and that's about all I need to know how well it works (not very) and what artifacts result (low fidelity).

Originally Posted by Clark2

(Interestingly, the HD Radio group on Yahoo! appears to be dead -- the last post before mine is dated Feb. 20, 2014, and the moderator does not respond to email!)

That doesn't surprise me - HD is essentially dead in the US.

Originally Posted by Clark2

I know from my car-radio listening that it's much better than Sirius/XM.

I'd say the net sound quality of HD and XM (via the satellites) is about the same. If you've found otherwise, it may be a result of the specific tuner you're listening to, and not the potential of the technology itself.