Not necessarily. A lot of local cable companies have relatively rudimentary commercial-insert machines, and can only run the same sets of ads across all channels. Plus they do just like real TV stations do, and shove in house ads when there's a spot they haven't sold. Thus Fox ads end up on CNN, occasionally CNN ads will end up on Fox, etc. I really doubt Fox paid to intentionally have their ads inserted into CNN's local ad slots. After all, they have no need to, with their ratings. Heh heh....