Jacob's Ladder uncut workprint

There's no way a workprint would've been aired on any pay or regular cable channel. Nine times out of ten workprints will always retain time code. So that fact right there means it will not be broadcast on television. Possibly an extended version existed and could've been broadcast, But this just seems to be like a rumor that's been floating around for over a decade.
Possibly if you found somebody that worked on the film they could have a copy- but it would usually have to be like the Director himself or a producer- not like a grip or the sound guy. Plus were talking about a film thats pushing over 40 years old. I wouldn't count on finding it sadly.

It's possible, I've read that it's been aired on Showtime and it's been on the movie channel, even possibly HBO. I do know that some of the deleted scenes exist and can even be found on YouTube, maybe a tech savvy person can take the scenes and add them back into the existing film that's available.

Someone else on another forum actually gave me this info, unfortunately the websites that have this info like TV Guide and Newspapers.com are both behind pay walls.

This page:page

That's OK