The LightSquared plan to provide a nationwide LTE wireless network that could reach both city and country is dead for the foreseeable future.  The NTIA letter asserting that no GPS interference fix is likely for years to come and subsequent FCC response give LightSquared almost zero wiggle room to escape its current trap.  Given the billions of dollars invested, it seems likely that Harbinger will have to turn to the courts for relief. So what lead to this very expensive…