Radio Man wrote:

Can one use open ladderline with a 20 mtr hamstick & the appropriate
tuner & work 20-10 mtrs.?

Sure. Don't know if it would be worth the effort, but it's
certainly possible. You're basically trading 'coax' problems
for 'ladderline' problems, there's a differnece in the mechanics.
No idea if the benifits would be worth the effort...
'Doc