Built a 20m coaxial-sleeve vertical dipole where the bottom half acts as both a 50-ohm transmission line and the bottom ¼ wave radiator due to RF skin effect on the outer conductor. Used standard 468/F calculation for initial half-wave length, then cut coax a foot longer for tuning with an analyzer. Performance: The 30m version tuned well across 40m-10m with my KX3 ATU, hoping similar results with this 20m slanted vertical configuration. Construction used RG-8X with toroidal choke at feedpoint. Has anyone else experimented with coaxial sleeve dipoles on HF bands?

Coaxial-sleeve dipoles were originally VHF/UHF solutions to avoid radials. Haven't heard of others using this concept on HF, but your experimental approach is fascinating. The physics should work fine - interested to hear long-term performance reports.

This looks like a great portable antenna solution! What's the overall height and how does it compare to a traditional dipole for POTA work? The no-radials aspect would save considerable setup time in the field.

You can learn more about this antenna concept by searching "coaxial-sleeved dipoles" online. Typically used for vertical VHF/UHF designs. Your HF adaptation is clever - the multiband capability with a tuner makes this quite practical for contest portable operations.