I am pretty happy with the design I used on the Matterhorn:
It is basically a up-and-outer with a high-Q loading coil at the base, a ca. 4.5m radiator and a T1 autotuner as an essential component.
I plan to evolve it so that the T1 will be replaced by a built-in variable LC- match and a Tayloe SWR indicator.
You can also use the autotransformer matching unit from a miracle whip antenna (from ebay) and attach a 4-5m radiator to it; this should be much more efficient yet ultra-portable and quick to set-up.