I've recently become a fan of AM radio. Properly processed it can sound pretty good. Of course, it is different sounding than FM, but it can still be quite pleasant to listen to. The interference issue is the biggest problem. All kinds of things put out amazing amounts of hash that drown out all but the most powerful stations.
Something I've recently noticed is interference originating from large trucks. That really puzzles me. They are diesels, so there is no electronic ignition system. The hash I hear is not the usual whine from an alternator. The sound is more like a rushing white noise. I've noticed this in the daytime when the LED lights are not on. Perhaps it emits from some of the electronics on board. I haven't taken an actual poll, but it seems to come from Freightliner and International trucks the most. Others may do it too. Whatever causes the interference, it absolutely wipes out AM reception as you go past the truck. It looks like another case of a lack of FCC over-site. Does anyone have any idea what might cause it? Whatever it is does a real dis-service to AM radio.