Success! 02:08 GMT 8/6/2022

Success at last. GPS Discipline was necessary to get decodes.

The other changes I made in the meantime: antenna and ground - appeared to help.
Pretty good results for a compromise antenna in horrible conditions.
I'll take it !

Antenna: Superantenna MP1 parts, mostly from a pre-2010 kit.

Concluded at 3:15 AM UTC 8/7/2022