The must-carry rules only apply to broadcast networks that don't charge the cable companies license fees.
While Saturday morning is when most broadcast networks schedule their children's programming, youngsters are more likely to be watching on weeknights and weekday afternoons.
The 30-second ad, "Imagine," will begin appearing on cable channels tomorrow before moving to broadcast networks, and the Fields campaign said it would run through the rest of the campaign.
HBO has sold both original films and prime-time series to broadcast networks before.
There are now more cable versions of ESPN (four) than there were broadcast networks (three) a decade ago.
His work, however, related to radio and television networks, which are broadcast (unidirectional) networks, thus predating the much larger impact of the internet.
Television networks using radio or cables were largely broadcast networks with minimum switching facilities.
Still, other analysts said that Cablevision should hold onto its cable networks because they give the company leverage with other cable providers when negotiating fees for rights to broadcast other networks.
Likewise, it also extends to broadcast networks.
And at his suggestion, they proposed the series to broadcast networks, rather than to cable channels.