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[burakkucat]

Your Hlog graph is not poor, it is abnormal. It is not what I would normally expect to see. I have explained -- to the best of my ability -- what I think may be the reason for your Hlog graph.

It is ridiculous to configure a circuit with an ~1 dB target SNRM -- other than for a quick test. A circuit that is stable will need 3 dB of SNRM "overhead" (at its lowest point).

Whether the circuit is provisioned aerially or underground has no bearing on its operation.

  

[konrado5]

Whether the circuit is provisioned aerially or underground has no bearing on its operation.

I've thought if circuit is provisioned underground, then circuit is much less capable of different interferences.
Can lightning cause interferences if line is undergroud?

I have explained -- to the best of my ability -- what I think may be the reason for your Hlog graph.

Should impedance mismatch cause unstability?

Best regards
konrado5

[roseway]

Konrado, it's time to stop, NOW. Repeatedly going over the same subject will not get you any more answers, and is very annoying to other members of the forum. We have advised you of this several times already.

Stop now.

[4candles]

I'm sure nobody in my town broadcast on 160m band.

Which means nothing.

160m signals can travel several hundred miles after sunset via the F2 layer (sky wave), and impinge on your line to a greater extent than someone using similar power ten miles away (ground wave).