I emailed my local ABC station (WTEN) to ask my question. And whaddaya know, they responded!

Apparently, I caught their broadcast of RetroTV on its very first day. They are still in testing mode. If they decide to keep it, they will not only advertise, but also include in on cable.

I feel like I've hit the jackpot.

And to all you "glass half-empty" folks out there: it's NOT the same as Nick at Night. It's better, if only because I don't have to stay up past 9pm to watch the shows.