CubicSDR provides a panadapter experience, showing the RF spectrum for the band you have selected. I use it with my Yaesu FTDX3000D radio frequently, along with an inexpensive RTL-SDR adapter.

I've prepared CubicSDR to be unretired from Fedora rawhide (F33), now that wxGTK 3.1 is available in rawhide. Package review ticket here:
https://bugzilla.redhat.com/show_bug.cgi?id=1821987 

Reviews appreciated. 

Thanks,
Matt N5MLD