"Tony Meloche" wrote in message
...
Why would reception improve - and noise drop - when the chassis
ground to the receiver is removed? This is noticeable on SW, but *very*
noticeable on MW.
Ground connection is to faceplate screw of a (verified) grounded 3-prong
outlet, the best grouond I can muster, at the moment.

Most likely picking up common mode noise from your household wiring. Those
grounds are great for 60 Hz, not so great for 1 MHz. Grounds often don't
make a lot of difference for SW reception, but in some cases can make a
world of differene (short run directly to an earth ground).