Some multiband commercial verticals will work without a ground system.
During my experiments earlier this year I tried an R7000 first with a large
ground system and then removed the ground system. I could barely tell the
difference. This check was done on 40m. Didn't see if this held for the
higher bands but I suspect it would.
The signal from the R7000 was a couple of dB lower than a full 1/4-wave with
the same ground system. I suspect that was mostly due to loading
inefficiency which is to be expected in short loaded antennas.
73, Rudy N6LF
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