The hallmark of a great baseball radio announcer is knowing when to remain silent. That way, the game speaks for itself. Near home base, a pair of parabolic dishes relay the smack of a catcher’s glove, the scrape of spikes on dirt and chalk, the fizz of the crowd. A crack of the bat, caught by a shotgun mic poking out the window of the booth, announces a home run long before the ball drops into the stands. There are many other microphones in the stadium — near the bases and along the outfield wall — but those are for television.