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You thought OpenStreetMap uses WGS84? No it doesn't (2019)
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
You can go to the Geoscience Australia website to find the GDA94 coordinates of this antenna and enter them in JOSM with the “Lat Lon Tool”. The Australian online AUSPOS service gives you the PPP results with GDA94, GDA2020 and IRTF (@epoch data) coordinates. When you load data in an editor, it should check all nodes coordinates, find the epochs, and dynamicaly move them to the actual localization with an Helmert transformation.
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