Out of curiosity, and because it's an interesting problem, I ran the report based on the Lat/Lon in your report, but at 43 ft (10 ft higher), and the NM for WHO actually went further negative. Presumably it has something to do with it being listed as 'tropo'.
http://www.tvfool.com/?option=com_wr...46ae9d09e39580
I don't have an answer, of course - I'm just following along as it's an interesting discussion.