Thanks, asugeorge. If anythint KNX might actually be easier than here at my home location. I used to go the twin cities on business several times a year over a span of roughly three decades. WTSO (ex WKOW) owns the channel up there. A nightly regular with a good signal. But, if you null it, the channel is relatively open, and you're oriented toward the west coast.
Here at home in the 60s and 70s, KNX wasn't a regular, but when the channel was less crowded I could snag it perhaps about 6-12 times a year. As recently as the early 2000s it would still pop up every now and then. Just null WKOW and WIBC and hope conditions were right. CHOK wasn't an issue. What helped me (and others) ID KNX was their distinctive traffic and weather togther sounder. It could cut through all the other slop on the channel, even if no other identifiable audio came through. Unfortunately for DXers, KNX discontinued the sounder several years back.
Fast forward to today, and basically the reason KNX is on my "wanted" list is to see if it's still doable around here barefoot on a portable. I believe it is. So KNX is a pet project for me. I'm not devoting a ton of time or effort to it, but I believe with a little luck I will pull it off. I'm pretty sure I've probably heard it at some point or another this year, but I couldn't get a positive ID, It doesn't help matters that KHMO, the 1070 in Hanibal, Missouri. runs a news-talk format with CBS network newscasts. So when KHMO is in, it's easy to get a "false alarm".