Originally Posted by GhettoRacingKid
wart did you have some shpere pic up there before? thats what i had seen. and it looked like it had a lightning rod.
Sorry, 4 hours sleep, all coffeed out .... suffering bad judgement in posting.
All three pics are acoustic gathering devices, what you saw was an acoustic ear used to listen for aircraft during WWII, the second is an acoustic wall used to listen for ships and Zeppelins during World War 1.
I got to thinking the wall was a bit unfair, and the ear way too easy.