Is this the Catalina (VH-EXG) you are thinking about Noel, I shot is down at Essendon in January 1980. At that time it was owned by
H. C. Sleigh, and it was used for mineral exploration from memory. The yellow bomb like device hanging from the rear belly was a
magnetometer, which would be lowered behind the aircraft to measure the strength and direction of magnetic fields. They would be
looking for ferrous metals, presumably Iron Ore in WA. I am sure I can remember it being parked in the GA Area (DOM5) back then.
It was parked on the grass right about here - love the security fence. This is opposite the car wash near McDonalds.
This is looking across the GA Area to the Qantas Office Tower.