Not really possible.
Without radials, any sort of unipole (end fed vertical) will be pretty poor. You can't get a single length antenna to match coax on both 10m and 20m, as a good match on one will be a terrible match on the other.
There are ways to deal with this, including using multiple lengths; traps; stubs; matching transformers; and so forth, but they are all more complicated than just a length of aluminum tubing.
Here's a design that actually does work on 10-12-15-17-20m and is tubular aluminum. Note it does use resonators and radials, but it's a real antenna that will outperform the A-99 -- a lot, and work on multiple bands: http://www.cushcraftamateur.com/Prod...oductid=MA-5VA
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