Nexstar Media ‘s $6.2 billion acquisition of rival TV station group owner Tegna is on hold after a federal judge ruled that the proposed merger “is presumed likely to ‌violate ⁠antitrust laws based on the combined firm market share alone.” The deal would augment Nexstar, already the biggest TV station group in the U.S., with Tegna’s footprint — resulting in a company with 259 full-power stations affiliated with networks including ABC, CBS, Fox and NBC. The deal would give the combined company