[Elecraft] Looking for shortened Ham-Stick antenna article

[n2htt at optonline.net]

I remember seeing  an article/recipe for loading a Ham-Stick style monoband antenna using a shortened whip and the next lower band antenna, for example using a 30m base with a 12" whip for 20 meters.
Anyone ever seen anything like this?
I am interested in mounting a monoband vertical on my Honda CRV, but I don't want to keep removing it, so I want keep the antenna short.
Thanks,
Mike N2HTT
K1 s/n 0566
KX1 s/n 099