Tuned across the AM band this a.m. and heard a het on the lower side of 1570 khz. It was there even without aid of a loop, but the loop brought it in louder. On my RS "PLL Synthesized World Receiver" it seemed to zero at 1566, which is the 9 khz frequency that would be logical. As soon as I hit 1566, the RS World Receiver had some guy speaking an Asian language, with splash from 1560 and some QRM from the Deportes station in California on 1570.
Heard a man speaking what seemed to be Korean -- not sing-songy like Chinese, def. not Japanese, and had some of the consonant sounds peculiar to Korean, so I'm pretty sure it was Korean.
It even came in barefoot on my TRF, which -- ironically -- was the radio that seemed to bring it in the clearest (it seems to have a really good ceramic filter, combined with a good audio section).
The RS World Receiver, the SRII and the Panasonic also brought in audio with the loop (didn't try them w/o the loop, though). Once I got it clear w/ the TRF I stuck with that radio....
It's always cool to hear something from across the Pacific, even if you can't understand what's being said. Guys around here (W. WA) with the bigger antennas seem to bring in Asian stations on an almost daily basis.