"TIL the most powerful commercial radio station ever was WLW (700KHz AM), which during certain times in the 1930s broadcasted 500kW radiated power. At night, it covered half the globe. Neighbors within the vicinity of the transmitter heard the audio in their pots, pans, and mattresses."
They stay on ice in the ocean for most of every year=marine. They retreat to mainland areas during the summers when the ice melts.