Sega Saturn Instruction Manual page 13

Connecting to a TV or VCR without Audio/Video Sockets
(Not available in France)
Connections to a TV/Monitor and Antenna
If an antenna cable is plugged into your TV (or if you have cable TV), use a Sega Saturn RF Unit (sold separately).
1.
Unplug the antenna cable from the TV, and plug it into the RF Unit.
2.
Plug the RF Unit antenna cable into the TV.
3.
Plug the RF cable into the A/V OUT socket on the back of the Sega Saturn console.
Note: If your television is connected to a VCR, check to see if your VCR has audio and video plugs to which to connect.
TV with Connected VCR
1.
If a VCR is already connected between the antenna and TV terminal, use a Sega Saturn RF Unit (sold separately).
Unplug the antenna cable of the VCR from the TV terminal. Then, plug this cable into the RF Unit.
2.
Plug the RF Unit antenna cable into the TV terminal.
3.
Plug the RF Cable into the A/V OUT socket on the back of the Sega Saturn console.