Hello again, Dagwood
Sorry you are having more trouble. Those two channels are very weak; it doesn't take much to knock them out.
You told us about your power inserter, but you didn't tell us what model of preamp you have.
You also didn't tell us what antenna you have. If you don't know the make and model, can you show us a photo of your antenna?
One thing might be different now: The trees might be thicker and taller now, so even if the leaves have fallen, the signals might be having a harder time now getting through.
If your antenna is made by Winegard, this video will show you how to check the CB8269 balun /combiner:
https://www.youtube.com/watch?v=TlQk...ule1MX8jCAfvPQ
You have checked the voltage coming out of the power inserter, but you haven't checked the voltage to the preamp at the upper end of the coax that connects to the preamp.
And you haven't checked the voltage to the preamp at the upper end of the coax when it is connected to the preamp. This is harder, because when you check the voltage to the preamp near the preamp when it is connected, you need access to the center conductor. I use a T-adapter for that:
This is for an RCA preamp, but the method is the same:
