The distribution of metals in the Galaxy provides important information about galaxy formation and evolution .
H ii regions are the most luminous objects in the Milky Way at mid-infrared to radio wavelengths and can be seen across the entire Galactic disk .
We used the NRAO Green Bank Telescope ( GBT ) to measure radio recombination line and continuum emission in 81 Galactic H ii regions .
We calculated LTE electron temperatures using these data .
In thermal equilibrium metal abundances are expected to set the nebular electron temperature with high abundances producing low temperatures .
Our H ii region distribution covers a large range of Galactocentric radius ( 5 to 22 { kpc } ) and samples the Galactic azimuth range 330 { } ^ { \circ } to 60 { } ^ { \circ } .
Using our highest quality data ( 72 objects ) we derived an O/H Galactocentric radial gradient of -0.0383 \pm 0.0074 dex kpc ^ { -1 } .
Combining these data with a similar survey made with the NRAO 140 Foot telescope we get a radial gradient of -0.0446 \pm 0.0049 dex kpc ^ { -1 } for this larger sample of 133 nebulae .
The data are well fit by a linear model and no discontinuities are detected .
Dividing our sample into three Galactic azimuth regions produced significantly different radial gradients that range from -0.03 to -0.07 dex kpc ^ { -1 } .
These inhomogeneities suggest that metals are not well mixed at a given radius .
We stress the importance of homogeneous samples to reduce the confusion of comparing data sets with different systematics .
Galactic chemical evolution models typically derive chemical evolution along only the radial dimension with time .
Future models should consider azimuthal evolution as well .