See the attached jpeg image file below. I have been noticing stuff like this while using JT65-HF for quite some time. This time I got a real good PRINT SCRN image of it. So far, I've asked the folks at QST and CQ and K1JT. I have emails into the Engineering Dept at the University of Illinois at Chicago (my Alma Mater) and W6CAZ that haven't been answered yet. BTW, I do have other PRINT SCRN images from other occurances but this is the best. So far, nobody has any idea about what it is or how it's made except we are all pretty sure it is not intentionally man-made. What the heck is it and how is it done?