I built a 6 element 432mhz yagi from instructions in the ARRL Handbook. I
used a 1" wood dowel for the beam and 1/4" aluminum rod for the elements. I
used a "T" match on the driven element. One on each side, just like the
illustrations show. And a 1/2 wavelength phasing line.

But the instructions don't show or say if the driven element is split in the
middle.

Shouldn't the driven element be split.