Reg Edwards wrote:

Ian, Oh yes they do.

Next to each half wavelength of line there is another half wavelength
of line in which the current is in antiphase with it. And so, in the
far field, the fields from adjacent half-wavelengths of line cancel
each other out.
. . .

No, they don't. They cancel only in two directions, directly normal to
the plane containing the wires. Radiation occurs in all other
directions, because the fields don't add in antiphase. An example of an
antenna which uses two closely spaced elements carrying equal
out-of-phase currents is the W8JK.

Roy Lewallen, W7EL