Distant, but not (necessarily) DX HD Radio reception

TTNDX: Distant, but not (necessarily) DX HD Radio reception

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HD Radio, a closed standard developed by the company iBiquity, is the standard for digital radio broadcasting in the USA and Canada. Unlike DAB (Digital Audio Broadcasting), the standard utilized in Europe, HD Radio is in-band, on-channel (IBOC), meaning that both the analog and digital signal (including any subchannels) are carried on the same frequency. A consequence of this is that the digital range of otherwise powerful stations is extremely limited, for example, in the case of WCBS-AM, a clear-channel AM station licesned to and transmitting from New York, New York, which transmits in HD, the HD range of the station is functionally limited to New York, Brooklyn, Newark, and immediately adjacent areas, while the analog signal carries strongly as far south as Trenton and Philadelphia. In spite of the signal constraints of HD Radio, I've been able to successfully recieve several HD stations in Trenton, New Jersey.

As a matter of clarification, the HD reciever I presently use is a Sangean HDR-14, which seems to have good sensitivity on both the AM and FM bands.

WCBS-FM, 101.1 MHz, New York, New York. Recieved in HD during a period when "local" WBEB-FM (Philadelphia, Pennsylvania) was not coming in strong enough (in spite of being closer, WBEB-FM often does not come in with RDS data or in HD).
WNYC-FM, 93.9 MHz, New York, New York. Recieved in HD on two occasions in April, 2024. WNYC ordinarily is not particularly strong this far south, so I was extremely surprised to recieve it in HD.
WCBS-AM, 880 KHz, New York, New York. Recieved in HD once. HD barely remained for more than a minute.
WWFD-AM, 820 KHz, Frederick, Maryland. This is the only HD/digital-only radio station operating in the USA to my knowledge. Poor signal. This one is the only actual DX station to make the HD reception list (with absolutely confirmed calls) so far.