During the cold war there were several western broadcasters that were funded to broadcast on the territory of the Soviet Union (see [1]) . This had a big influence on the country's people's minds. Everyone was able to listen to the point of view of opposition using a simple standard radio receiver.
Nowdays WiMAX-type networks may be deployed to countries like North Korea, Iran or Egypt (and other oppressive countries) with similar technologies. Laptops or simple cellphones that are already widespread in the country may be used to access the network. People can start criticizing their government and coordinate their efforts for change.
Just a general thought that doesn't lead anywhere. But I thought it is worth it to publish it somewhere.
[1] http://en.wikipedia.org/wiki/Radio_Free_Europe/Radio_Liberty#Radio_Free_Europe