Welcome to AVS, Jerry! I recognize your name from TCF...
One note - "FOX 17/62" is a pair of low-power analog stations. 62 is licensed to Youngstown and 17 to Masury PA. The 62 tower may be in the same general direction as 21/27/33, but the power on both 17 and 62 is a lot lower. Heck, where you are (Newton Falls, I presume), you wouldn't likely even GET the 17 half of the pair due to full-power WDLI in Canton on the same channel. (How they squeezed THAT in, I have no idea!)
As far as the DT goes, WFMJ-DT 20 is the only station with a reasonably high power level. WYTV-DT 36 is, if I remember right, about half the power of WFMJ-DT. As noted in the message above mine, WKBN-DT isn't even on yet.
I'd heartily recommend an outdoor antenna if you can swing it. With enough firepower, you might even get the Cleveland and/or Pittsburgh stations, at least some of them. You're obviously farther away from Parma than you are from I-680 and South Ave. in Youngstown (the closest thing Y-Town has to an "antenna farm"), but at very least an outdoor stick would get you reliable reception out of your home market.