(Reuters) - Sinclair Broadcast Group Inc said on Wednesday it has filed a counterclaim in a Delaware court to Tribune Media Co's lawsuit filed in early August against the company claiming a breach of contract.Tribune terminated its $3.9 billion (3.03 billion pounds) sale to Sinclair and filed a lawsuit, saying the rival TV-station owner mishandled efforts to get the transaction approved by taking too long and being too aggressive in its dealings with regulators."Today, we filed our response..