It looks like the antenna is introducing some intermodulation. I've seen this also in the REE DRM broadcast on 9630 kHz, so I wonder if it's DRM specific intermod, or just intermod due to strong signal, because that's a really strong signal. An antenna with signal gain is pretty helpful.
The intermodulation is more evident here.
Around 20:28 UTC someone accidentally switched the transmitter off or something. In the gap you can see -105 dBm interference.
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