Enemy aircraft was detected in an amazingly backbreaking, elephant eared way!
How incoming enemy aircraft were detected before the advent of radar
STRANGE ACOUSTIC "EARS"
BEFORE RADAR - ON A SWIVEL
STRANGE ACOUSTIC "EARS"
BEFORE RADAR - GERMAN
STRANGE ACOUSTIC "EARS"
BEFORE RADAR - ON WHEELS
STRANGE ACOUSTIC "EARS"
BEFORE RADAR - ENGLAND
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