Mike Coslo wrote in :

The big question I have always had regarding the balun was are we
reducing performance by eliminating feedline radiation? For a lot of
antennas, that may be a big part of the antenna system.

Claiming feed line contribution to radiation as a performance factor is
usually a specious claim, and more likely to be made by someone with a
commercial imperative than a genuine interest in radiation performance. You
know, if you can't solve a problem characteristic, call it out as a
feature.

In this case, feed line radiation would usually skew the pattern upwards,
not necessarily a desirable feature, probably not desirable in most
situations.

Owen