You are really looking at two different devices:
- ATSC to Analog converter (box where you plug your antenae, and other end into TV) to be able to watch broadcast TV;
- Netflix-capable device with analog output
Is this correct? I don't think there is single device which combines both functions. ATSC converters were dollar-a-piece (literally, with a coupon) couple of years ago when analog TV ceased to exist. These days, you can get a box with media player functions, but none of these I looked at supports Netflix.