Is "single viewer television broadcast signal intrusion" possible? If so, how?

How is single viewer broadcast signal intrusion possible?

How could someone do a "Single viewer broadcast signal intrusion"?

The Max Headroom broadcast signal intrusion is famous. But there is a similar equally unexplained interruption hailing from England. Today lets turn our attention to the southern television broadcast interruption

Who or what was the culprit of the 1987 Max Headroom Signal Intrusion?