The ADS-B Ground Station roll-out is moving forward at an accelerating
rate and should be completed Nation Wide by the end of 2012. It is
fully funded and all the necessary contracts are in place.

The vast majority of the country will have coverage above 1,800 ft. See
http://www.faa.gov/about/office_org/...cast/coverage/

I have no financial interest in any of this.

--
Mike Schumann