FM (bandstop) notch filter recommendation?

Do I need to use FM bandstop filters in the Kraken inputs? If so, which specific one would you recommend, that doesn’t cost 100$ a piece?

You don’t have to run FM bandstop filters. The only reason to do so would be if strong broadcast FM is actually causing problems in your experiments. If you did need them RTL-SDR Blog filters would do the job cheaply.

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for my RTL-SDR I use;