Jim, if you want a base/mobile set up and go with Yaesu Ft891, You will need a good antenna (I have Yaesu Atas120a) which can provide for both base and mobile co.ms. you will need a power supply (converts house current AC to DC current (13.8 volts and 23amps) needed for equipment. If you go with Yaesu, and the atas120a antenna, Yaesu also has a automatic “antenna tuner”
That works with the radio and antenna. Good headset and microphone and all requiuredby coaxial cables and proper connectors. Grounding clamp and copper wiring also is a must. My rig cost approximately $1,900. You can go to any online retailer of HAM Equipment and they will assist you in setting you on the right path. Good luck.

I like your answer! ALSO, most of these modern radios have processors MADE IN CHINA AND OVERSEAS! If in a conflict, parts will be unavailable fast. Contrary to most replies, power ALL radios at least one a year for 24 hours simply idling. It keeps the radio’s capacitors from drying out.
Also, a decent faraday cage is a microwave oven (broken junk!) With the cord cut flush.

they would use a lot more power (which could also be at a premium) + repair/replacement tubes would be an issue.

It would be cheaper, quicker, and easier to buy a modern unit and put it in a faraday cage. Think sealed metal can, insulated with cardboard between the can and the electronic inside.

Faraday Cage the easy way.
I bought a new 20 gal metal trash can.
I wrapped the inside of the can and the lid with cardboard so the contents would not contact the outside of the can. That would be bad.
I dropped in all my electronic gear and installed the lid.
The EMP comes in three waves but it is too fast to walk over and stop once created.
My cost was the can, $25. the cardboard, free, some tape, ? and my time.

The FCC rules and regulations specifically prohibit private, scrambled or ciphered communications on the Amateur radio bands.