Two things: Firstly hams equipped for emergency communications keep backup radios (disconnected from antennas) for this very reason. And if their gear was dam

Two things: Firstly hams equipped for emergency communications keep backup radios (disconnected from antennas) for this very reason. And if their gear was damaged by EMP, the hams would have the knowledge to effect repairs, or at least build simple valve based gear by scavenging old TVs, etc. Again, this is a popular activity at fields days: A race to see which team can first make contact by means of a simple Transceiver built from scavenged junk.