The rust in the pictures is a bit of an eye-opener. Rusty metal can be a semiconductor and thus can create conditions where signals can modulate each other and be re-radiated at a strong enough level to cause local problems. I've had an interference problem - an HF transmitter messing up a VHF receiver - which proved to be a rusty cattle fence in the field next to the house. That took a lot of finding, as the whole fence was radiating: eventually got there with a hand-held receiver and uncharacteristic patience. A spectrum analyser would have been the weapon of choice. A man can dream.
If the corrosion is on a connection carrying noisy DC, either on a power line or a ground, that noise could be superimposed on an ambient radio signal. It wouldn't have to be very much corrosion either. And the orientation of the aircraft could certainly affect the RF level present at the faulty junction and thus the re-radiated field, either through shielding effects or by wiring acting as an antenna.