need comment for signal quality

[SunExpress]

Interference around 125kHz is not important. The worst is in the 17-18kHz around. There are often many harmonics with high amplitudes. See what this looks like in the time domain signal. Unfortunately, there is nothing you can do about it - in the 10kHz-30kHz range. These are the frequencies of lightning signals. It can help reduce gain or change antenna orientation.

Thanks Kriu,