How incoming enemy aircraft were detected before the advent of radar ???

STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS

STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS

STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS

STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS



STRANGE ACOUSTIC "EARS" 
BEFORE RADAR -   ON A SWIVEL
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS - ON A SWIVEL 


STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS - (COLOR)
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS - ON WHEELS
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS
STRANGE ACOUSTIC "EARS" 
BEFORE RADAR -   GERMAN
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS - GERMAN

STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS - GERMAN  
STRANGE ACOUSTIC "EARS" 
BEFORE RADAR -   ON WHEELS
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS - ON WHEELS
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS 

STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS

 
STRANGE ACOUSTIC "EARS"
BEFORE RADAR -   ENGLAND
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS - ENGLAND
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS
STRANGE ACOUSTIC 'EARS' - BEFORE RADAR - LISTENING POSTS 
Posted at 12/22/2010 03:11:00 PM

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