[toomuchtodo]

This is somewhat ridiculous on the part of the US government. This is data easily collected by survey-grade GNSS systems, that anyone could collect. If the Russians wanted to do SIGINT, they wouldn't announce where they're putting their gear; they would load a van up with a couple hundred thousand dollars worth of RF equipment and position near their targets.

To give you an idea of reference stations in the US for the GPS system, head on over to: http://www.ngs.noaa.gov/CORS_Map/

Granted, these are used for post-processing position data for increased accuracy, and not for updating mission-critical orbit/atmospheric error data, but the principal is the same.