Broadcasting & Cable: Viacom’s VH1 is under new leadership. Chris McCarthy has been named general manger. Tom Calderone, who had been president, is leaving the network. McCarthy had been overseeing MTV2 and Logo, among the few Viacom networks showing ratings growth. McCarthy will report to Doug Herzog, president of the Viacom Music and Entertainment Group. Like many Viacom networks, VH1 has faced ratings challenges. In the second quarter, ratings were down 19 percent. New GM McCarthy is described as “a forward-thinking leader for this new era in media.”