Reinstalling the Halow antenna and using an RTK antenna cable has made a world of difference with my Halow reception. The original Halow antenna cable appears to have been pinched during assembly.
On the charging station my Halow signal strength was -65 from day 1. After replacing the Halow cable (using the RTK antenna cable until a new Halow cable arrives), I now have -41. AND I get Halow reception where I never had it before. (Behind my metal shop for instance and beyond the grassy knoll.)
I suspect my cell usage will drop significantly.