Antenna coax to Antenna In on 533
Antenna Out on 533 to Antenna In on TV (Sony Bravia HDTV)
HDMI Out from 533 to HDMI In on TV
First, make sure the coax from the antenna in on the TOP connector on back of Mag.
If so, try connecting to your TV with a diff. cable type, like Composite YWR RCA, S-Video or Component RGB... no HDMI connected. Select that other TV input to see what the Mag is doing.
Then, if no joy, connect the antenna to a 2-way splitter with one output to Mag and one to TV. This will eliminate the coax pass-through circuit as a possible suspect.