It is quite amazing that they can track targets using HF Radio.
This installation has been blamed for occasional interference on MARS frequencies. In as much as it is a government facility, they may be using some of the same frequencies allocated for MARS.
There are a total of three installations – Texas, Virginia, Puerto Rico. The facility is located on US 281 South of Alice Texas on the West side of the road.
Read more details about this radar installation here in the attached PDF.
See pictures here: http://www.txarmymars.org/photos/#num=0&id=RaytheonRadarOverTheHorizon