CompuNurd said:

Didn't think it was too easy back then, no wireless network to tap into. Probably some very sophisticated stuff to be able to do that.

Click to expand...

Not really. The signal going to the CRT is high voltage, high current, and varies up and down according to the brightness of each pixel. A varying current in a wire is a radio transmission antenna. So all you need is a receiving antenna (probably a highly directional one so you can pick your target), some amplification, and a matching (or configurable) monitor. Some way of recording it for future reference also I guess, probably direct to tape in the day.