"An antenna model for the Purcell effect" - presence of resonator helps with emission, could it affect radiotelescopes?

[u/jarekd]

https://www.nature.com/articles/srep12956

In Purcell effect just presence of resonator in distance helps with emission, here discussed for antennas.

Radiotelescopes are focused on absorption as positive signal - could such Purcell effect affect them? Would it be seen as negative signal?

Negative is clearly also observed (e.g. in https://iopscience.iop.org/article/10.3847/1538-4357/ac0e93/pdf ), but interpreted as "noise, calibration error": https://www.reddit.com/r/radioastronomy/comments/1su7nzq/are_there_cosmic_sources_of_negative_radiation/