the older RG2200 set top box has a coaxial (RCA connectors) SPDIF output while the newer RG2400 set top box has an optical fiber connection...dsaintmb said:Do the current MTS SD STBs have a SPDIF output? I Know u can hook up more than one t.v. with those antena deals but can u rent more than one STB for the same house so u can get DD AC-3 5.1 on two receivers?