And don't get me wrong, I'm not saying something like "don't ever buy shortwave" I'm saying it should be low on the priority list.
Now a days even the AM stations may not be online as they are the low budget. The top 40 pop FM radio stations with their million dollar advertising contracts have the $ to have the nice backup generators in order to get and keep those contracts so my bet is those and some of the TV stations will be back running when something happens. Our local, user supported Christian programming station gets knocked off the air for a bit every time there is a rainstorm, its all about the $ now.