A friend of this blog - Joe Steinmetz, K6SAT - has been monitoring milsatcom activity associated with Antarctica's Operation DeepFreeze. He caught the activity on 263.625 MHz in the clear. The POR UHF satcom traffic from Antarctica was heard with call signs of ICE 26 and MAC center.
Recordings of the activity he monitored are at the links below:
http://moon-bounce.com/hearsat/ts3_recording_10_11_07_18_53_58_por_mil.mp3
http://moon-bounce.com/satcom/satcom_files/ts3_recording_10_11_09_16_12_41_ant.mp3
I invite readers to check out Joe's website and his setup at http://moon-bounce.com/. Thanks Joe for sharing your intercepts with the MMP readership.