Why at the South Pole?


Very cold, and high altitude
Very low atmospheric moisture.
Atmos. *nearly* transparent to microwaves

Atmosphere extremely stable (no daily sunrise/set)

No Sun for 6 months of the year:
Can only work on instrument in summer.
Observe in winter.

Fields remain at constant elevation angle
and superb low foreground sky available at high el!

Existing infrastructure and logistics.