The Supreme Court will hear the Aereo case, which could reshape the TV landscape. Paul Thomas/Bloomberg via Getty Images

The U.S. Supreme Court on Friday agreed to hear a closely watched appeal filed by the four major broadcasters against an online television service, Aereo, backed by media mogul Barry Diller, that they claim steals copyrighted TV content.

Walt Disney Co.'s ABC network, CBS Broadcasting Inc., Comcast Corp.'s NBCUniversal and Twenty-First Century Fox Inc. appealed a decision by the 2nd U.S. Circuit Court of Appeals in April that denied their request to shut down Aereo while litigation moves forward.

Aereo, backed by Diller's IAC/InterActiveCorp, charges users a low monthly fee to watch live or recorded broadcast-TV channels on computers or mobile devices. Aereo does not pay the broadcasters.

In a relatively unusual step, Aereo urged the high court to hear the case even though it won in the lower court because it would like a definitive answer on the issue.

The Supreme Court said in a brief order issued on the case on Friday that Justice Samuel Alito will not participate in it. The court generally does not disclose why justices are recused.

A ruling is expected by the end of June.

Aereo subscribers can stream live broadcasts of TV channels on mobile devices using miniature antennas, each assigned to one subscriber. The service was launched in March 2012 in the New York area. The company has since expanded to about 10 cities and plans to enter several more.

The broadcasters claim the service violates their copyrights on the television programs and represents a threat to their ability to control subscription fees and generate advertising.

Among those filing court papers in support of the broadcasters are the National Football League, Major League Baseball and various media companies, including Metro-Goldwyn-Mayer Studios Inc.

CBS said in a statement on Friday that Aereo's business model is "built on stealing the creative content of others."

Aereo counters that its service does nothing more than provide users what they could obtain with a personal television antenna.

"We believe that consumers have a right to use an antenna to access over-the-air television and to make personal recordings of those broadcasts," Aereo chief executive officer Chet Kanojia said in a statement.