Yes, CGA has an RCA connector on the back for NTSC composite. This is what we used for the demo. There is also a header on the card itself, to which an RF modul

Yes, CGA has an RCA connector on the back for NTSC composite. This is what we used for the demo. There is also a header on the card itself, to which an RF modulator can be connected, for a regular TV antenna input (this was an option, probably because of regulations. An RF modulator generates a lot of interference, so fitting one stock would require expensive shielding. Fitting it 'aftermarket' circumvents that). The IBM 5155 portable PC abuses this header to connect the composite signal to an internal monochrome CGA monitor.