I did this 4 element design for channel 6 using EZ-NEC:
3/8" diameter elements.
Reflector length 71.6"
Driven length 72.4"
Director #1 61.2"
Director #2 57"
spacing
Ref-Driven 22.8"
Driven-D1 3.1"
D1-D2 20.1"
The feed is direct using 75 ohm coax; no balun.
If you want to play download this:
https://www.eznec.com/demoinfo.htm