I have definitely eliminated one problem: a bad solder job (er, my own, actually) on a PL-259. This was on the stretch of coax that I had previously used for mobile ops, which may be why I was always having so much trouble getting anyone to hear me when I went mobile. I'm feeling a lot better now. This should mean my problem will be solved by a new piece of coax. Also a new PL-259 to fix the coax for future mobile operations.
I think I finally figured out a way to mount the HTX-100 in my truck. Yeah, yeah, 10 meters is dead, but this is when it's the most fun. You never can tell when a band opening will happen, and when it does, it's lots of fun.