The 'broadband' aspect and design goals of the G3TXQ design (K4KIO, MW0JZE, DX engineering) is less to do with nice low SWR across the wider bands, more to do with slightly more consistent F/B and forward gain across the bands.
Correct! My revised design was aimed primarily at extending the performance bandwidth, not the SWR bandwidth. It was serendipity that it also happened to place best F/B at the same frequency as minimum SWR, which is not the case with the original design.
73,
Steve G3TXQ