Sinclair Broadcast Group is not as well-known a name in television as Fox News' News Corp. or CNN's Turner Broadcasting System, but its reach may rival that of a cable juggernaut. The company is the largest owner of local television stations in the country, with 173 stations in 81 broadcast markets that stretch from coast to coast and just about everywhere in between, at a time when local news outpaces national news outlets both in overall viewership and trust.