One major problem is that HAM would work in all senerios besides a gaint CME which in turn wouldnt shudder, but even at that local 2m and 440 would work and like in my case I can do 65miles simplex on fm with 2m off batterys so you might get info that way. In case of nuclear attack all the lower HF bands would be crazy plus alot of 2m repeaters have backup and some solely use solar and batterys for power sources.