From what I can tell from reader comments, the antenna uses a modified "hairpin match", which is more commonly used with yagi antennas.
Mike (M0MSN) does a good job of explaining the theory and construction used in this high-power dipole antenna.
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=F8wemg6-uIw.
Here are some comments from Mike (M0MSN);
DP200 7 - 54MHz 500W Portable Dipole Antenna - Better than a GP Antenna?
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Aloha es 73 de Russ (KH6JRM).