New Wireless Audio Lets MLB Umpires Make All the Calls Very Loud and Clear

You never know who's on the other side': Amateur radio enthusiasts use old-school tech to connect – GeekWire

Angel Hernandez's Blown Call Must Lead to Revamping of MLB's Replay System, News, Scores, Highlights, Stats, and Rumors

Phillies vs. Marlins Game 2: results, score, MLB playoffs schedule, pitchers, lineup, highlights

What sound should an umpire make when calling a strike - WHO!, HUH!, HEE! or STEEE! : r/baseball

How MLB Umpires Learned to Explain Replays to Crowds - The New York Times

MLB umpires to use microphones to announce replay review decisions - Sports Illustrated

Ted Williams: The Biography of an American Hero: 9780385507486: Montville, Leigh: Books

MLB tests 'robot umpires' for calling pitches

Ted Williams: The Biography of an American Hero [Book]

What is the New PitchCom Device and How Does it Work?