Article by John, KL7JR that talks about this:
https://www.eham.net/article/34857
Referencing other articles he wrote:
http://www.hamuniverse.com/kl7jrcbverticals.html
In these articles John, KL7JR, uses the Wilson FGT-x series of antennas. And he shows how different lengths of stingers can be used with these antennas to move them to the 10, 15 and 20 meter bands.
For my experiments I bought a pair of FGT-5 (the 5 foot one) Wilson antennas off Amazon. Then I bought a pair of 36 inch stingers and an MFJ-347 mini dipole mount from HRO.
My first test/experiment was to use one of the Wilson antennas in a mag mount. This was placed on a metal table and 3 tape measures were used as radials. It worked pretty good on 20 meters without a tuner! Using an LDG tuner it also worked on 40, 15 and 10.
Next I used the MFJ-347 to make a dipole out of the two Wilson antennas. This was mounted on a 16 foot mast made from 2x2 lumber. You may note short bits of wire hanging off the tips of the stingers. These brought the dipole into the 20 meter band with no need for a tuner.
Again, using an LDG tuner it also worked on 40, 15 and 10.
Further thoughts: I'd like to find a couple of the shorter FGT-x antenna discussed in John's articles to experiment a bit more. When I do I'll add more to this article.