You've told us about radiation from the connections to the generator
and
the termination.

Now tell us about radiation from the line.

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Ian, you are falling into the same sort of trap as old wives who
imagine most radiation comes from the middle 1/3rd of a dipole because
that's where most of the current is.

It is self-misleading to consider the various parts of a radiating
system to be separate components which are capable of radiating
independently of each other. They can't. A system's behaviour must
be treated as a whole.

We have already discussed that the power radiated from a generator +
twin-line + load is a constant and is independent of line length.

Total power radiated is equal to that radiated from a wire having a
length equal to line spacing with a radiation resistance appropriate
to that length. The location of the radiator, insofar as the
far-field is concerned, can be considered to be at the load. The
current which flows in the radiator is the same as that flowing in a
matched load. And the load current is independent of line length.

Mathematically, the only way for the total power radiated to remain
constant and independent of line length is for zero radiation from the
line.

In summary, the system as a whole BEHAVES as if there is NO radiation
from the line itself - only from fictitious very short monopoles (or
dipoles?) at its ends.
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Reg, G4FGQ