That's weird Glenn, I did a reply 2 hours ago and nothing from my second post.
Anyhoo, I run the WH6CZB EARCI endfed the club sells, 9:1 balun and also a simple 1/4 wave vertical. The RFI showing on the waterfall doesn't change, still basically the same.
Also, the RFI gets worse as I tune down frequency with 80 meters at night being really bad, but that's 80/75 meters for ya.
Again, when I remove an antenna from the 7300 input all RFI goes away.
Tnx Glenn, 73