Update; all is working fine now and I can tune on several bands. My problem was a cold solder connection! I ran the coax through the ladder tubing so I then had to solder the terminal up top on a cold day. I checked the coax for continuity or shorts afterwards and thought all was OK. But I later found out the meter had a bad battery which gave erratic readings. I was stunned! I re-soldered and have had no more trouble. I do use the optional ground radial system, but I suspect I could discontinue that. I only use it because I deploy the antenna as I'm setting up at camp, rather than swivel it upside down or sideways and leave it mounted. I did bond all the ground components together.
2011 Sabre Silhouette 260BHS
2006 F-250 6.OL