Wall Street is upbeat about the impact of Nexstar‘s $6.2 billion acquisition of local TV rival Tegna, mainly because it could trigger another wave of consolidation. That’s also the prevailing view across the industry, even among Nexstar’s biggest rivals. Nexstar announced the closing of the transaction Thursday evening, soon after the FCC and the Department of Justice said they had granted their approval. Legal challenges remain, however, with state attorneys general and major pay-TV operator DirecTV fil ...