Around 70% of NBC’s revenues are derived from advertising while content licensing and retransmission consent make up for the rest. The split between advertising and non-advertising income is much higher for NBC as compared to other broadcasting networks. Disney’s (NYSE:DIS) ABC derives 45% of its revenue from non-advertising sources and CBS (NYSE:CBS) around 50%.
via Comcast’s NBC: It Will Take More Than Higher Ratings To Grow Its Broadcasting Operations — Trefis.