Michael Nardone and I have been corresponding about his interest in PennSound. He's currently spending a few months on Vancouver Island, but typically he and his wife live in a cabin on the east arm of Great Slave Lake in the Northwest Territories. (If you want to check this out on Google Maps, look for the town of Yellowknife and move about 150 km eastward.)
What is the northernmost listening to PennSound? It seems likely that Michael holds that record. "Probable northernmost Pennsound listening," he writes, "took place during a week up in Resolute. I remember listening to David Antin's war talk with a few arctic scientists stationed there."