Television’s old guard finally opened a chink in Aereo Inc.’s armor this week, winning a ruling that left the Internet TV upstart and its lawyers fighting to limit the damage ahead of arguments at the U.S. Supreme Court in April.

U.S. District Judge Dale Kimball in Salt Lake City issued a sweeping 26-page decision on Wednesday granting a bid by a group of broadcasters for a preliminary injunction blocking Aereo’s service in Utah, Colorado, Kansas, New Mexico, Wyoming and Oklahoma. Aereo’s lawyers at Durie Tangri immediately sought to appeal the ruling to the U.S. Court of Appeals for the Tenth Circuit and asked the judge to stay his decision in the meantime.