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It looks like you are wanting to work with an azimuthal projection in Tableau. One way that you can do this is to use a background map and transform the latitude and longitude for your antenna locations using the same azimuthal projection. Then you would be able to plot them in Tableau.
I wrote up some basic instructions for another forums post related to using a projected image as a background map. It would involve working in QGIS and doing a bit of data transformation: