Max Headroom Signal Hijacking (2020) [video]

Poster here: the first thoroughly researched documentary I've been able to find on this and it came out just a few months ago. Acquired all of 90 views on YouTube.

Vice had a good article (posted on HN years ago) that did some good research work, but several trails they followed we now know turned out to be red herrings:

https://www.vice.com/en/article/pgay3n/headroom-hacker

Anyone on HN have a good idea of what it would have cost to mount this kind of hack in Chicago in 1987 and what kind of equipment would you need?