Here's a little history lesson. Back in the '50s, Mexico City's first four TV stations, channels 2, 4, 5 and 8, all privately owned, merged and became Televisa. Two became a national program with relays all over the country. No network affiliates as we know in the U.S. Four was a regional program covering about the middle third of Mexico. Five was a national network flagship station. They carried children's and family oriented programing in the evening and local affiliates could do what they wanted in the morning and afternoon. The network programing gradualy filled the afternoon as well as evening. The last time I saw a schedule, several years ago, the netwrok was on from 2 PM to 2 AM weekdays. Don't remember what they did on weekends. Eight, which later moved to nine, was also a regional network. Nine is now listed as Galavision.The government put an educational/public affairs station on channel 7. A Mexico City night club owner put a private station on 13. I understand the programing was pretty good because of all the night club talent he had access to, but the signal was so weak nobody could watch it. Eventually the government bought him out and continued to operate the station as an entertainment channel. Seven and 13 both operated under the name Imavision.Meanwhile the Instituto Politécnico Nacional (National Polytechnical Institute) put an educational station on channel 11.A few years ago the Mexican government decided to get out of the TV business but didn't want to leave Telavisa with a monopoly so they sold 7 and 13 to a private company which became Azteca. I believe they operate both stations as entertainment channels. They can both be seen nation wide; not sure if they are networks or relays. There are now four UHF's in Mexico City. Instituto Politécnico Nacional operates 22 as well as 11, and I suppose Televisa owns 28, 34 or 40.