roadcasters are making a new stab at trying to block the Aereokiller service, which, like Aereo, provides consumers with tiny remote antennas that send their choice of programs to them over the Internet. Our complaint filed today in the federal district court for the District of Columbia underscores our commitment to vigorously protect our copyrighted programming from illegal appropriation by opportunistic pirates, the broadcasters, which include Fox, NBC and ABC, said in a statement on Thursday. The broadcasters have already had some success in California blocking Aereokiller but have struck out in their legal efforts to halt the Barry Diller-backed Aereo, which now operates in New York and Boston and will soon launch in Atlanta. Meanwhile on Thursday, Aereo CEO Chet Kanojia told investors that half its customers are pay-TV subscribers. He noted that 70 percent of Aereo users say that they use the service to watch television away from home.