I applaud you for your effort but as has been stated before on line petitions do not work. One reason and the main one is there is no way to verify the signatures. At least with a printed petition you can tell who signed it. Also computer programs can be set up to generate on line petitions and signatures. The people in power know this and do not give petitions of any kind much thought but they really don't take on line petitions seriously. Retro TV will only be added if the station thinks they can make money by airing it. the webpage www.snopes.com
the urban legends webpage has a great article on why on line petitions don't work. Go to the inboxer rebelion section and look for the section marked petitions.
I'd suggest calling or writing your local TV station and asking them if they would consider carrying Retro TV on on one of their sub channels. You're more likely to get a response by getting people to put pen to paper and actually write letters or make phone calls to let them know you're interested. As nice as email is I'd still recommend the old fashioned pen and paper in this case. It's harder to ignore a letter than it is to ignore an email.