Further to belzybob’s reply it’s definitely worth exploring that. The gainmap script I wrote might help visualise in-band noise and nearby noise at different gains. You’ll need to use the gain values supported by your SDR, or just use integers and let it auto adjust to the nearest supported values. I had something similar; I added a Uptronics filtered preamp which helped pull in signals from much further out but I had to lower the gain a notch to quieten down in-band noise in order to ‘hear’ those signals properly.
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