  Spectra in the CH $^2\Pi_{1/2}$, J=1/2, F=1-1 transition at 3335 MHz were
obtained in three 5-point crosses centered on the Galactic plane at $\ell =$
50$\arcdeg$, 100$\arcdeg$, and 110$\arcdeg$. The lines of sight traverse both
Giant Molecular Clouds (GMCs) and local, smaller entities. This transition is a
good tracer of low-density molecular gas and the line profiles are very similar
to CO(1-0) data at nearly the same resolution. In addition, the CH 3335 MHz
line can be used to calibrate the CO-H$_2$ conversion factor (X$_{\rm CO}$) in
low-density molecular gas. Although this technique underestimates X$_{\rm CO}$
in GMCs, our results are within a factor of two of X$_{\rm CO}$ values
calibrated for GMCs by other techniques. The similarity of CH and CO line
profiles, and that of X$_{\rm CO}$ values derived from CH and more traditional
techniques, implies that most of the molecular gas along the observed lines of
sight is at relatively low densities ($n \le$ 10$^3$ cm$^{-3}$).
