Another issue to consider is in-band vs out of band equipment. An AM/FM radio is in-band and it has a real antenna. The EMP doesn't need to couple through the powerline, it can enter through the antenna. IIRC both an FM/AM radios RF and IF frquencies are in-band to an EMP so it's an easy target.

But talking about losing small electronics is really trivial compared to losing the power grid. We can all hide small cheap radios and other electronics (laptop computers) as back-ups, but when the grid goes down because those big-ass transformers have been fried, we'll all be living off grid for a long long time.