The advantage is a very clean radiation pattern and an impedance of 50 ohms at the feed point, allowing direct feeding with coaxial cable. The absence of side lobes in the radiation pattern positively affects the antenna gain as well as the suppression of interference. The possibility of direct feeding with coaxial cable simplifies the construction of the antenna and ensures lossless excitation of the radiator compared to antennas that require a matching element.
Justin is currently modeling a new LFA yagi and is waiting for patent confirmation. A freely available description of an 18el.yagi on 2m and a low-noise 5el.yagi on 6m is available. You can read more at www.g0ksc.co.uk. Will a new trend of LFA yagi antennas emerge?