Swoozie Pellegrino wrote:
What might the impedance of this look like, say, if I
took the last 10 meters of a 100' 50-ohm coax piece
and slice it to split out into a 20-meter sleeve dipole
and hung the dipole part vertically from the balcony?
Can I just screw the other end onto the back of
my transceiver and go? Or....

When I plugged it into a 2x6146 transceiver equipped
with a pi-net matching output network, it worked well. :-)
I would guess the SWR will be less than 2:1.
--
73, Cecil http://www.w5dxp.com