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I had something similar (noise spikes) when connecting the antenna directly to HF+.
It became much better when inserted a 1:1 balun with galvanic isolation (that is: distinct coil windings).
For my tests, I used NooElecs 1:9 balun, not ideal, but worked nevertheless.
I haven't tested yet, my guess those very cheap CCTV baluns may be used for experiments.
Old network cards (those that used to have both BNC and RJ45 outputs around 1990-97) often have a boxy component near the RJ45 jack that looks like a relay. These are actually combined 1:1 isolation baluns (one each pair) enclosed in a single package. A friend reported they worked very well in LF to HF range.
On Tue, Oct 22, 2019, 16:23 andrea ottaviani via Groups.Io <firstname.lastname@example.org> wrote: