Short wave transmissions can be bounced off the ionosphere for over-the-horizon communications. Ham radio operators may still be in existence in the US after the blasts, assuming they protected their sets from EMP.
Nuclear subs at sea can (could?) receive Extremely Low Frequency (ELF) transmissions underwater by extending a LONG wire antenna to pick up signal from Clam Lake/Chequamegon-Nicolet National Forest, Wisconsin or the Escanaba River State Forest, Michigan/Project Sanguine transmitter. For a view of this in action, watch the film "Crimson Tide".
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"Let's roll." Todd Beamer, aboard United Flight 93 over western Pennsylvania, September 11, 2001.
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