Metox did leek the signal from its Local Oscillator out of the Biscay Cross aerial and it was detectable from a homing receiver on an aircraft at ranges up to 50Km. The Germans knew the Local Oscillator frequency of the equipment, built a homing Receiver and trialled it in July 1943. The Story about the RAF pilot saying the British were homing on Metox is also true, he was interrogated in Early August 1943 and the U-Boat command were informed on the same day.
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