JN wrote:
Hamsticks and their clones are for US 75m (4MHz) and not directly tunable to
80m (3,5 MHz)

I plan a Hamstick dipole for Digimodes and CW for say 3560 kHz.

What is the best way to lower the resonance frequency
Some type of capasitive loading at the end of base(coil) section
or an inductance at center wich could maybe also function as impedance
transformer?
What is the feedpoint resistance of Hamstick dipole?

Any ideas or experiences?

A hamstick has measured 12 dB down from a screwdriver
during 75m mobile CA antenna shootouts. That screwdriver
was about 10 dB down from a 1/2WL dipole. A 75m hamstick
is little better than a dummy load having a radiation
resistance of maybe 0.5 ohm and an efficiency in the
ballpark of 1%, i.e. 100 watts in, 1 watt out.

That said, the best way to accomplish what you are trying
to do is to use extenders on the bottom sections. The
longer the section underneath the coil, the greater the
radiation efficiency. I have extenders in 1, 2, 3, 4, 5,
and 6 foot lengths. They really come in handy for antenna
experiments.

If you could use 6 foot base extenders, that would make
the dipole 8+6+6+8 = ~28 feet long overall. Assuming you
could get that antenna up at a decent height (50+ feet),
I think the performance might be "not bad".
--
73, Cecil http://www.w5dxp.com