Ciro Mazzoni Loop and Flex Panadapter 6600.

I have an MFJ loop, good for 30m and up. I found it not terribly useful on receive with a wide panadapter on any of the 30/20/15m bands, especially useless to see what was on 20m. I have a separate broad (i.e. all) band receive antenna I use all the time - it’s a “loop on ground”, 60 feet of insulated wire around the base of a big tree, dug just under the sod, connected with a beverage transformer. Works a treat, albeit a bit low on signal strength, but that is compensated for by the really low noise. Totally stealth for the receive antenna :-) Usual tx antenna is in the attic, a ~160 ft loop, again, keeps the HOA hounds at bay.

That is one monster loop!

It's also quite expensive as well