Roku - VCR - Digital Converter

[fixmeplease]

So how do I hook all 3 of these to my old TV's. Right now I have my air antenna going thru my converter box, to my VCR, and on too the TV with a common splitter type to male cable connection on my tv's. I am not using any RCA wiring at this time. (red, white yellow wires)

I'd like to add my Roku into this mess, and yes, I do have a rca cable hookup on my roku. I do not have an RF modulator yet. Also, there are rca connections on my converter box and my vcr.

If it really helps to unhook my vcr that would be ok, but I'd rather have it. I'm aware of the blonder tongues and if I have to get one I will, but for now...

Thanks!