I used to have a small well made faraday cage for storing a laptop. (I was also using stupid fonts[1] that were meant to make TEMPEST harder, and FDE, and etc etc.) I don't do any of that any more, apart from the disk encryption.

https://groups.google.com/forum/#!topic/comp.society.privacy...

https://www.cl.cam.ac.uk/~mgk25/emsec/softtempest-faq.html