Abstract: The latest Fermi LAT catalog (2022) reaffirms the trend of previous releases: a good fraction of high-energy sources do not have confirmed counterparts in any of the other electromagnetic spectrum ranges. In the extragalactic sky, most of these sources are associated or identified with blazars, the subclass of AGN. The counterparts found in our galaxy cover a wide range of types, with supernova remnants, pulsars, and related sources being among the most numerous. In this talk I focus on the less studied sources in the search for counterparts: massive stars and their stellar bow shocks. The research is being carried out using radio observations with the best interferometers at low frequencies, where non-thermal emission is expected to dominate.