Any more news - while not quite "keeping me up at night", is certainly a mystery I would like to follow to the bitter-end.
There are some points we should not loose - the noise is not evident on the nav aids (were those ever explicitly identified - ADF, ???) and not on the hand-held, but on both aircraft radios.
So far we have not heard what happens if the hand-held is connected to the aircraft antenna...? I believe the aircraft antenna WAS updated at some recent point?
There was also some discussion regarding selection of squelch on/off - was that ever explored?
- GY