Not a whole lot received tonight, but I did notice that carrier up from CO was doing its weird "excursion" thing again (see above), and this time I slowed down the waterfall and caught some images of it:
The trace is a bit difficult to make out due to the slow sample rate and high noise floor, but you can see that it starts at its usual spot around 1,100 Hz up from CO, wanders around a bit, then settles down again to the same frequency it started from. CMRadio suggested that it might be an appliance generating the signal, which I guess could be the case, except that its strength seems to vary a lot with time; tonight it wasn't very much above the noise floor. It's got a very long, slow curve to it, whatever it is, and these shapes only showed up well because I slowed the sampling way down to a fraction of what it was for the image with CO in it, above. It was running at about three pixels per second, so each of these traces represents maybe three minutes of reception.
Not sure what it is, and I don't think it really has a whole lot of bearing on stuff, but I still found it kind of interesting...