No, I mean ELECTRICALLY balanced. And with the feedline at right angles
to the antenna so that it doesn't pick up anything by induction. It's a
tricky thing to do, yet back in the old days hams used to feed dipoles or
extended double zepp antennas with open wire line and not get much RF in
the shack. I know mine didn't.

Ran a Windom in Texas in 1965 (WA5KBO) with only 150W and burned a hole in
my lip (no joke) with the RF on the metal ring around the microphone! The
Windom was a good performer, but I could not effectively ground the rig. I
was in student housing (College Station) and was not allowed antennas but
improvised!