One odd thing about INRA, the big Mexican ratings measurement company, is that it will often publish its own studies. Recently, they went on a kick of releasing share percentages for most, if not all, of the markets they survey.
Of course, that includes Tijuana:
The top 5 in Tijuana are XHTIM, XHLTN, XHA and XHTY. In fact, the "double Invasora", were it to be counted as one station, would pull in 20 percent market share and be counted as the market leader ahead of XHTIM with 16.7 percent share.
The top-rating US stations are KLNV, KLQV and KHTS, occupying 10th through 12th place respectively. The US stations *still* manage to pull in more share than the Tijuana AMs.
These are 8+ ratings conducted in August.