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In college, while living in the "half underground" lower level of a new brick 12-plex, I used the downspout(s) as a random vertical antenna. My counterpoise was the AC wiring in the building and an aluminum knitting needle pushed into the soil at the bottom of he spout. With my trusty HW-8 and Argonaut 509 (amd crappy MFJ manual tuner), this was a DX machine. I was too inexperienced to realize that it really shouldn't have worked...
Years later, in a new-ish townhouse, my downspout antenna was a total dummy load, no matter what. I replaced it with an attic-mounted 40-meter horizontal loop fed with a remote autocoupler (antenna about 26 feet AGL)...and THAT was an even better DX machine. My townhouse was at highest point in the county, and I could receive TV signals perfectly from 50-70 miles away with the TV Yagi laying on the asphalt driveway...

With spout antennas, each is unique.
And yes, ditch the UNUN, as you almost certainly don't need it.
Best of luck,
Kirk, NT0Z

My book, "Stealth Amateur Radio," is now available from www.stealthamateur.com and on the Amazon Kindle (soon)