What about a multiband verticl fort he uppoer bands .. Stacked with some gain like the x 510 or the x 6000
Omnidirectional . 2 or 3 bands . with some gain . can be used also for local repeater or emergency work . Just an idea For 6 and 10 better use a small beam But you can start with a ladderline fed dipole for 6 and 10 Many antannas possible so I would sax . see what you have in your junk box and garage . and then make something with that parts. Greetz Dg9bfc Sigi