“Right, sir.”
“It’s not likely we’ll get anything today or tonight,” Jerry replied. “Oh, well, we’ll have to have patience. Sooner or later the station will go on the air again, and then we’ll learn its location.”
Louise and Penny were curious to learn more about the monitoring truck. Jerry took them inside, introduced them to the officers, and showed them the radio apparatus.
“Our truck is equipped with rotating antennae,” he explained. “Whenever the unknown station starts to broadcast we’ll be able to swing our loops toward the signals. Then we chart the signals and where the lines intercept, the station is located.”
“As you explain it, Jerry, finding any radio station is a simple matter.”
“It is, providing the station doesn’t move in the meantime. Unfortunately, Mr. Voice from the Cave is an elusive fellow.”
“You have no idea who the man may be?”
“No, he’s known to FBI agents only as B4 which is a code number.”
“What is the purpose behind the broadcasts?” Louise inquired. “Enemy propaganda?”
“We know that the station is enemy owned and operated,” Jerry replied. “So far that’s about all we do know, for we’ve been unable to break the code. We suspect that persons connected with the station may be aiding German prisoners to escape from the country.”