  In this comment of the article [arXiv:2002.01150] "Locating the source field
lines of Jovian decametric radio emissions" by YuMing Wang et al., 2020, we
discuss the assumptions used by the authors to compute the beaming angle of
Jupiter s decametric emissions induced by the moon Io. Their method, relying on
multi-point radio observations, was applied to a single event observed on 14th
March 2014 by Wind and both STEREO A/B spacecraft from 5 to 16 MHz, and
erroneously identified as a northern emission (Io-B type) instead of a southern
one (Io-D type). We encourage the authors to update their results with the
right hemisphere of origin and to test their method on a larger sample of
Jupiter-Io emissions.
