In general: Things work far better on TV than in real life. This includes James Bond toys. Standoff distance is your friend; for both electromagnetic radiation and 0.5mv^2 from fertilizer and fuel oil. The second is so much the case that I knew of a major secure installation that had a blanket TEMPEST waiver; i.e. machines radiating were not a threat. Why? They had a minimum one mile standoff distance between the outer fence{s} from public roads/land and the inner buildings where the classified work took place. And the few visitors inside the compound were controlled such that there was no chance they'd wander in with a van of receivers. I think it safe to say the Pentagon has many precautions of this nature in place. Tried to park next to the building recently ;-? -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433