Might take a look around Beechcraft Dr and N Perimeter Rd. Still there last time I went around a few weeks ago. DHS is pushing HF capabilities again, so should be there for a long time to come.
If you Google map it you can still see it where Aaron said. But it is for certain gone physically.
I wonder if they just trashed it or took it down nicely.
I was going through some old photo files and I found these. Not sure of the date. These are resized to make them RR compliant; the real files are almost 2meg each.