...as I recall from seeing some of the other retro schedules of the period, midday sign-ons were the general policy at all the Kaiser and Field stations of the '70s, which included WKBS/48 Philadelphia, WKBD/50 Detroit, WLVI/56 Boston, WKBF/61 Cleveland, KBSC/52 Los Angeles and KBHK/44 San Francisco as well as WFLD. I suspect WKBD was the first station to expand into the mornings after it was microwaved regionally to distant cable operations in Michigan. I'm fairly positive that WVTV/18 and WCGV/24 Milwaukee did the same, although WVTV went to an earlier morning sign-on in the mid-to-late '70s when it was also microwaved to cable systems as far away as North Dakota, and the company microwaving them began to pipe in WBBM-TV/2 Chicago to fill the off-the-air hours and turn the combined cable channel into a 24-hour operation (although WBBM-TV occasionally signed off as well for a couple of hours after its late-late movie). WCGV's main draw in its early years had been the SelecTV OTA pay service, and in its earliest weeks before SelecTV cranked up, WCGV actually signed off the air at 7:00 P.M. on weekends after AWA "All-Star Wrestling" (which had come over from WVTV)...
...and, as I've noted previously on this board, KFIZ-TV/34 in Fond du Lac, Wisconsin, would sign on at 10:30 A.M. to relay WHA/21 Madison's airing of "Sesame Street," and then sign back off at 11:30 A.M., later returning to the air at 2:00 with either "I Love Lucy" or "Make Room for Daddy" (or, on some weekends, a relay of a Milwaukee Bucks or Brewers game from WTMJ-TV/4 Milwaukee before WVTV got those contracts). KFIZ-TV folded in November 1972...