TV using a RF Modulator

[Console User]

Can you use a RF Modulator on my 1986 RCA Set when using an antenna signal? If so. how do you hook up the cables? Can you use the RF Modulator with the Converter Box and the red, white, and yellow cables for hookup?

I wonder why the Lasonic Converter Box doesn't work well with my 1986 RCA Set? It causes Red & Green lines in the background of the picture in dark broadcasts especially more noticeable of this problem.