I assume you are referring to the Veon 101 then the RF output plugs into the Antenna IN on your TV then use the Analogue tuner (if it has one) on the TV to tune it in .
RF looks ok on old crts but terrible on Plasma and LCD .
What model VEON box? Sat or UHF?
Any RF output from the VEON 101 would be analogue so the Mac tuner would need to be analogue to find the VEON's output channel.