Thanks for the reply. I want's sure what GPS RTK was so I googled it. There is a large oilfield survey business located less than a mile from where I live. That is probably who I am receiving. I have seen oilfield surveyors out in the field with the round white about 15 inch or so diameter gps antennas on top of a wood pole marking locations. It makes sense that they would be on an itinerant frequency since they will have to travel to many locations throughout the major oil producing states.
The article I read about GPS RTK says it is capable of 1 cm accuracy. Daaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaamn!