I notice with channels close to the border (not Mexico City obviously) do advertise both US and Mexican companies. I think it is the border is fluid concept
I have 1 or 2 channels out of Moterey (hope I spelled that right) in Mexico that advertise Texas companies. A former Moterey resident confirmed the channels as being Moterey or at least receivable in Moterey with just an antenna. On that note some of the American channels broadcast shows from Mexico and I know many US movies/shows are shown in other countries with language specific dialog put in place. Univision on G10R shows Mexican TV shows, mainly on the weekends.
Are you getting the G23 channels? Trece is 13 and if these are the missing IA6 channels there should be a 13 in the upper corner of the screen. I am going to have to scan that one on
C band. She will be so happy to have her channels back