What would someone have to do to "take over" all the TV channels in the world?

Question

Kind of like Cobra Commander or any of the other countless ficticious evil villians did. You know, where everyone in the world is watching TV, and then it goes to static, and the bad guy comes up on the screen and is on every channel.

Is that possible? Common sense tells me no, but just for fun, what would someone have to do in order to accomplish this? Is it possible to have powerful jamming devices all over the globe, or to sabotage all the TV transmitters, leaving only yours intact?

Not interesting in hearing "no that's stupid" More interested in hearing "You're right that is ridiculous, but if it were possible, they would have to....." This is just for fun because I'm bored at 1am.

Answer 1

You pretty much got it.  Powerful jamming devices all over the world.

However, to do a pretty good job of coverage sabotaging a few key transmitters would be good.  Major satellite up links from the networks, state run TV stations, and cable companies would probably get most people fairly quickly.  

That is a most bang for your evil buck approach.  All the minor TV stations going to all the minor (antenna) viewers probably aren't worthy of hearing your evil plans any way.

Answer 2

Bribing every network executive in the world would probably be the cheapest way.