Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.
A bit more than a 2dBi improvement at 90 degrees. That’s with the reflector length optimized for gain. The modeled reflector height was .1m AGL.
The downside is that it messes up SWR somewhat. I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.