I'm 15 miles from PHT's tower as the crow flies and I have too much interference in my audio nerve center to pull in 1210's AM HD signal reliably - even with C. Crane's active dual coil antenna (KYW is somewhat better, but still not a full time lock). I was doing okay until about a year and a half ago when I must have introduced a piece of equipment that added enough nearfield interference to the HD radio to break the deal on the AM side (possibly one of the four web radios).
Since then, I rely on the FM HD repeaters. It's a shame, too, because PHT's AM stereo HD signal sounded better than the FM HD repeater. C'est la interference..... AM's a technological relic that's just about out of time in the GHz world.
Unless I'm stuck in the car and I want to hear a talk show that's not carried on satellite radio, or check out WDAS(AM) now that WHAT is gone, I don't listen to band-limited AM anymore when a superior-sounding webstream is readily available.
Maybe after the current attempt at in-band digital broadcasting on AM is shelved, digital processing in newer radios will be enough to buy the bigger analog AMs a decade or two. That's if anyone outside of us Sangean/Sony/Tecsun devotees has a decent portable AM radio that can be moved away from the interference. Then, between the cell phone, the pacemaker, the embedded memory enhancing chip with GPS and radio controlled artificial joints I'll no doubt need, it'll be unavoidable interference all over again!