Hosa DRA-503 Double Shielded 75ohm Coax Cable with Gold Plated RCA Connectors. The DRA-500 series cables are designed specifically for S/PDIF. They are also great for use as a composite video cable.

Serviceable, all-metal plugs for rugged durability and ease of repair
True 75-ohm (RG-59/U) coax for accurate data or video transfer
OFC spiral shield for effective EMI and RFI rejection and flexibility
3 meters long