MESA, Ariz. — The A’s new radio home is one of their many former spots on the dial, and the team also will provide a free in-territory streaming option for all of its games.

The Chronicle has learned the A’s are set to announce that KTRB (860 AM) will carry all of Oakland’s games this season and the audio also will be found on the TuneIn app, the first time a major-league team has a direct partnership with a free streaming service. In conjunction with providing game audio, TuneIn will launch a full-time A’s channel that provides team-related content 24/7.

“To continue the momentum we’ve been building, we need to cover much more than just the live games,” A’s chief operating officer Chris Giles said. “We need a content platform where we can bring stories to life.”

KTRB last partnered with the A’s from 2009 through ’10, when the signal strength was weak at night in some spots of the Bay Area, but now it’s more powerful. The transmission towers have moved, and the station successfully petitioned to increase its nighttime wattage. The team anticipates coverage of the entire Bay Area, plus Sacramento station KHTK (1140 AM) will handle gaps in areas to the east.

“We explored lots of options during our process, focusing on our goals of enhancing reach, providing a consistent home for our games and delivering the depth of coverage our fans deserve,” Giles said. “We were unwavering in that pursuit and we’re thrilled that we were able to deliver meaningful enhancements in each area for our fans.”

For fans living outside the A’s broadcast territory, audio content will be available via subscription to the MLB At-Bat streaming app and MLB website.

The A’s previously split with KTRB when the station was sold at a bank auction after the 2010 season; the team considered purchasing it, but instead entered an agreement with 95.7 FM The Game. That relationship thudded to an end after last season, with the A’s — who won 97 games and made the postseason — taking some parting shots at the station for what the team believed to be a lack of promotion. Meanwhile, 95.7 cited poor ratings for dialing back on A’s talk during the day.

This is the 15th time the A’s have changed flagship radio stations, including three stops at KFRC and two each at KNBR, KNEW and KTRB.

At one point this offseason, there was speculation in the local radio market that the A’s might not have a broadcast partner in time for the season. Now, for the first time, the A’s will be able to offer an expanded schedule of spring training games: They’ll air all but one game, a split-squad contest March 10 when they will broadcast the other against the Giants instead.

Lead play-by-play man Ken Korach will return for his 24th season in the booth, and Vince Cotroneo is back for his 14th season on the broadcasts. Ray Fosse will continue to make regular appearances on the broadcasts when his schedule allows, and Chris Townsend will provide expanded pre- and postgame shows.

There will be no changes to the A’s telecasts, The Chronicle has learned, with Glen Kuiper doing play-by-play and Fosse serving as the color analyst. Dallas Braden will return as an in-stadium reporter and analyst on the NBCSCA telecasts and he is expected to again sub for Fosse as the main analyst for 35 games.

KIQI (1010 AM) and KATD (990 AM) will provide Spanish-language broadcasts of 72 games, with the team of Amaury Pi-González and Manolo Hernández-Douen.

With the A’s network of 17 affiliates, the team expects to reach north to Butte and Mendocino counties, east to Sacramento and south to Monterey and Fresno.

“We’ve never had this much coverage,” Giles said. “And all our games will be on TuneIn and 860, without preemptions. Our fans will always know where to find us. That’s a huge win.”

Susan Slusser is a San Francisco Chronicle staff writer. Email: sslusser@sfchronicle.com Twitter: @susanslusser