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bigger LOG.....

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IQ_imbalance:
OK, I give up.  Apparently any antenna that runs in my backyard picks up a hell of a lot of QRM from somewhere.  Probably something in my office, but who knows. 

Back to the LOG in the front yard and it's very long coax run. 

kris:
  Well, you have terrible disruptions!
Something similar occurs periodically in my QTH, but the signal peaks are more rounded / fuzzy, the transmission width is probably up to 1 MHz. Someone posted a similar image with the comment that these are interference from LED power supplies. I did not find any dependence on the time of day or devices turned on in my apartment / neighborhood. Having compared three antennas with different directional characteristics, I found that the highest level is on a dipole antenna hanged 35m above the ground,
and the lowest on a dipole at a height of 1.5m. This suggests that the signal comes at a low elevation angle, i.e. far away. The signal appears in not very long cycles and is sometimes synchronously tuned by several +/_ kHz. I suspect this is some kind of OTHR in my case. The moment of start and end of the transmission is clear as on / off, not a slow ramp.
   Maybe in your situation the only antenna that enables satisfactory reception will be the magnetic loop?

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