In <itqk249euvpcd9l0493umu3cmqsf9pulnj@4ax.com> Jeff Liebermann <jeffl@cruzio.com> writes:

>The 60 and 120Ghz frequencies are at the peaks in atmospheric
>absorption. These are sometimes use for short range radar, where
>stealth is important. The more atmospheric attenuation, the small the
>effects of ground based radar detection or jamming. These frequencies
>are also popular for communications above the atmosphere (i.e. between
>orbital devices) as they cannot be sniffed by ground based receivers.

Sure, that'll keep the Russkies from finding
them. But it won't protect us from the Ceylons.

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