How far have individual stars been seen by radio telescopes? Writing this answer got me thinking.

As far as I understand it, stars themselves radiate most of their energy at optical wavelengths (near-IR through near-UV).

Various types of stellar objects may flare in various ways when in-falling matter from an accretion disk or companion is heated in magnetic fields or undergoes transient nucleosynthesis, but I'm excluding these types of processes and asking only about radiation from the stellar object itself, in steady-state.

Question: How far have individual stars been seen by radio telescopes?
Some types of red giant stars are susceptible to intense water and silicon oxide MASER activity in their outer envelopes. This results in intense radio emission. Examples of such maser activity have been observed in the Small Magellanic Cloud,at a distance of $\sim 60$ kpc  (e.g. van Loon 2013).

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IRAS 05298−6957 (van Loon 2013): Note the logarithmic wavelength axis; the water maser peak lies at about 18 cm / 1670 MHz.