I've built a number of passive loops over the years, starting w/ a MW loop from a schematic from Radio Nederlands. I screwed that one up royally, but it worked on 90 and 40/41 meters with the Walkman tuning cap I used with it. I was able to dx Papua New Guinea, something I wasn't able to do with my wire antenna's and get rough headings on my fellow pirates and found most of them were full of crap about where they were tx'ing from. So was I, so there were no hard feelings, just laughs.
Passive loops of that size, one meter, on HF work about as well as a 60 ft. outdoor wire, but they're directional and null interfering stations to an extent, so there's plenty to listen to. You can simply set them by the window and have fun. I used to put them on a picnic table in the backyard in warm weather, but the neighbors always asked a lot of questions. (I used nylon bags full of gravel to tighten the wires on my dipoles. They thought I was practicing Voodoo, and the bags were to keep bad luck away. Lol.)
I've never tried the MLA-30, but I have listened to online SDR's using it. They seem to work well and are quiet, but I don't know if the owners have modified them? Most radio heads like to tweak their antenna's, and I suspect many of MLA-30's I've encountered have been tweaked. I know for a fact one of them has, as the owner is an old friend. It was sounding good earlier tonight. Have fun playing with them.