That is the antenna that Scott Tilley VE7TIL used to receive signals from the Chinese spacecraft Tianwen-1 in orbit of Mars. In a recent SpaceWeather article, Scott comments on the importance of SDR receivers in these deep space reception efforts.
I've been watching the Elser-Mathes cup for a long time. I dedicated my book "SolderSmoke -- Global Adventures in Wireless Electronics" to my kids, Billy and Maria, noting that they were both possible future winners of this most prestigious award. Scott Tilley's work has put us a step closer to an award ceremony for some intrepid radio amateur.
Here is a good article on the Elser-Mathes Cup:
Scott was in the news last year for finding a zombie satellite: