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

The problem with using hamsticks on higher frequencies is the loss in
the coil. The 20m hamstick has too much inductance for any higher
frequency and thus has more loss. Losses are probably worst case at the
self-resonant frequency but I don't know what that frequency is for a
20m hamstick and I don't have a 20m hamstick to test. Perhaps someone
with a 20m hamstick and an MFJ-259 will run that test and report the
results. In general, though, it is not a good idea to use hamsticks on
higher frequencies than their resonant frequencies.

However, using parallel 18 MHz hamsticks with ladder-line to cover 20m,
17m, and 15m is probably not a terrible idea.
--
73, Cecil http://www.qsl.net/w5dxp