One BIG Question...

From where the hell this interference comes from, on 72MHz band?
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FCC

For what it's worth I don't think that all interference is just picked up by ones antenna as a signal.....I think that for the most part the interference that affects our planes is affecting our radio signal while it is in electromagnetic form..Before it hits the antenna..
A radio signal is an electromagnetic wave that can travel through most objects...
When electricity passes thru a wire (spark plug wires) it radiates an electromagnetic field to the sides.......
You guys know that magnetic turns to electric and electric turns to magnetic right? So part of your radio signal travels right thru your plug wires and part thru the surrounding electromagnetic field and gets to your receiver antenna at exactly the same time as the rest of the signal?? I wouldn't bank on that! Maybe the distorted part of the signal blends in with the non distorted signal and kind of resonates to create a signal that is slightly off or fluctuating... PPM times off of the signal and PCM keeps reading the codes... Now if part of the signal is totally gone or unreadable the PCM will have holds before failsafe kicks in. So with intermittent interference you may only experience holds and never have a failsafe condition.