Multichannel News: The big four broadcast networks — ABC, CBS, NBC and Fox in that order — remain the TV brands that consumers in an annual survey identify as the top “must keep” programmers, said Solutions Research Group. In the eighth annual such survey, ESPN and Discovery follow in the fifth and sixth position, while HBO has moved up to No. 7, its best showing since the survey began. In another highlight from the online survey of 1,400 U.S. consumers, ABC, Fox and CBS are the top three brands for the 18-34 age demographic.