Upon the introduction of digital television in Mexico, most stations used virtual channels that matched their former analog channel positions, with a select number of stations branding as their physical channel (such as XHMNU-TDT in Monterrey, which eschewed virtual channel 53 for 35). However, Mexican television is considerably more centralized than in other ATSC countries, with three of the four national commercial networks branding with their Mexico City channel numbers. There was also the potential that new entrants, which would almost universally be on UHF, would be disadvantaged by higher virtual channels than existing stations that began on VHF—a particular concern given the recent award of a national television network to Grupo Imagen.