As requested, here are the screenshots from my station earlier this evening around 6:15 PM on the 6m band in segments (50 - 52 MHz and 52 - 54 MHz). I think there's a fair amount of harmonics here - some of the HF band is being seen (and heard) inband. Frankly, with the right antennas and playing with the gain adjustments (and perhaps having a highpass filter that has a knee at 40 MHz would be the ticket.
The following pictures are from my LimeSDR V1.4 using the RX1_L Port:
This first set of pictures are straight off the HF antenna - there's a fair amount of FM in there and that's an issue that the developers continue to work in the firmware and in the apps:
The next images are the 6m band in chunks with an FM Band trap applied to minimize (or eliminate anything much above 80 MHz:
Again, without the right 6m antenna, time to play with gains to make it right, and some app/firmware fixes that are still being worked, the data I have here - frankly - is a little subjective. But it's what my LimeSDR V1.4 is 'hearing' in the 6m band. It's my intention to have preselection added to the front end since the Lime tends to be a broadband performer in receive. Preselection would DEFINITELY root out a lot of what we're seeing along with adjusting the gain(s) properly to eliminate the possibility of IMD.
Not sure this will help you, but as they say 'downtown': "...there it is...".
73 de Marty, KN0CK