I had an OCFD for several years that worked the world on 100 watts SSB. The only time I needed the internal tuner was at the edges of 75 / 80 meters and the high end of 40. Otherwise it was plug & play into 50 ohm coax for 20, 17, 12 and the bottom 1 MHz of 10. No-Go on 30 and 15.
Supports were a pair of 30' push-up TV masts topped with 5' of grey PVC conduit as the masts were 120' apart and the wire needed some separation from the mast. About 8' of wire at each end drooped a bit, average height of the middle section was around 30'.
I started with 136' of 10 ga THNN stranded wire, cut 45.5' from one end. Feedpoint used a home-brew 4:1 Guanella dual-core "current" balun wound with #18 stranded silver teflon wire on "43 material" 1.25" cores. Do not use a single-core "voltage" balun. You want near equal current in both legs.
Get the wire up in the air, route the coax as it will likely be permanently installed, then take SWR readings at the radio and mark them down in chart form for each band. Prune only the long end of the wire by an inch or two if needed. Re-chart your SWR readings per band and decide if you want to prune another inch or two. Look for the best compromise in the band segments of interest to you and think it over before you cut again. You'll be juggling variables on multiple bands. An overall best compromise is what you're looking for.
The antenna was adequate for regional use on 80, 'continental' coverage on 40, DX on 20 through 10. It will not load on 30 or 15, but there is a way to add a vertical drop wire on the long leg for 15 and perhaps 30 meters. I never bothered. The rig here won't TX on 60 unless I do a mod so I have no comment on that. Purists will argue that tuning the antenna by SWR at the radio end of the coax is poor form, but that was the most practical method I could come up with.
General coverage RX is excellent from AM BCB through 10 meters and it will load on six, but don't expect to outperform a Ringo with it. Likely the balun is struggling at that frequency. First Q I made with mine was into Croatia on 12 and I took that as a good sign that it works. The wire was aligned true north-south with the short leg to the south. This gave a nice cloverleaf pattern on 20 to the NE, SE, SW and NW which worked well for me into EU and OZ... Had the wire been run east-west it would likely have done the same. Best DX was into Johannesburg and Durban Sud Afrika on 20. Considering that's about half way 'round the world I figured that was "good enough".