skypilot,
I would go to a wide open area (think parking lot) to make sure there's absolutely no chance of something blocking your signal. What you're saying is consistent for a blockage to the lower right hand side of your LOS. 110 is plenty strong, 119 drops drastically and 129 seems non-existent.
If you're still having the issues in a wide open area, then you may have an alignment issue as eluded to by Bill. If not, then you just had a bad line of sight.

