Still, if you really want the job done right, perhaps they should go get Baghdad Bob out of retirement. He had it down pat.
Even if they'd had them, there were no satellite broadcasts for them to listen to or watch. :) They did have radios and could most likely pick up commercial shortwave broadcasts from around the world, where greatly exhagerated reports of "anti-war" activity in the US were undoubtably to be found. Some of those would have been replays of US radio and TV broadcasts.
However the real target of the dizinformatzia coming out of the media is precisely the will of the people of the United States, just as it was in the late 60s and early 70s.