[Pete from Shawnee Mission]

Directed at government agencies and I suppose the military, some low cost protections, but some are pretty easy.

Electromagnetic Pulse (EMP) Protection and Resilience Guidelines for Critical Infrastructure and Equipment Feb 2019 (Unclassified)

https://www.cisa.gov/sites/default/files/publications/19_0307_CISA_EMP-Protection-Resilience-Guidelines.pdf

On 2nd page under :

Table 1. Four EMP Protection Levels for Infrastructure and Equipment

Unplug power, data, and antenna lines from spare equipment where feasible. • Turn off equipment that cannot be unplugged and is not actively being used. • Use at least a lightning rated surge protection device (SPD) on power cords, antenna lines, and data cables; maintain spare SPDs. • Have either EMP protected backup power or a generation source that is not connected to the grid with one (1) week of on-site fuel or equivalent (e.g., renewable source). • Wrap spare electronics with aluminum foil or put in Faraday containers. • Use priority phone services like GETS, WPS (for cell phones), and TSP; join SHARES if applicable (see Appendix C). • Consider land mobile radios with standalone capabilities, HF radios, and FirstNet. • Store one week of food, water, and other supplies for personnel. • Use battery operated AM/FM/NOAA radios to receive Emergency Alerts

[Tilted Irish Kilt]

See also, Post #18 in terms of what you can do to protect yourself and your electrical and electronic equipment from and EMP (Electro-Magnetic Pulse).

[Pollard]

Wrap spare electronics with aluminum foil or put in Faraday containers

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Store one week of food, water, and other supplies for personnel. • Use battery operated AM/FM/NOAA radios to receive Emergency Alerts

I used to keep a handheld scanner with wx channels wrapped in foil and kept inside an ammo box.

One week of food would not be near enough if a large solar flare or specially designed nuke set off at just the right altitude hit us and damaged most electronics. Try a year's worth.