Since Van Eck phreaking tools exist which can read keystrokes and RAM states on specific machines from blocks away, and since no one talks about these tools, I am leaving this comment here.
Yes, it is possible to recreate the contents of screens from quite far away, it is possible to piece together a lot of data from magnetic fields leaking from computers but this is not simple nor something that easily lends itself to longer distances.
In short, the reason nobody talks about those tools is because they don't exist.