Not sure if I watched it the night Channel 13 ran the entire serial, but I did watch the episodes week to week (either Friday or Saturdays).

They also ran ZORRO'S FIGHTING LEGION, and during a Pledge Night they had Buster Crabbe, and a PBS staffer dressed up as Zorro (in a kid-size cowboy hat and black domino mask) asking viewers to phone in donations.
I remember they also showed FG's TRIP TO MARS, and THE MIRACLE RIDER, among other serials.