Difference between ATSC and NTSC tuners on a TV. An ATSC tuner is often called an ATSC receiver or HDTV tuner. It allows reception of ATSC digital television (DTV) signals broadcast over the air by TV stations. To receive ATSC (DTV) signal the TV must be hooked up to some type of external entenna
After nearly 70 years, the majority of over-the-air NTSC transmissions in the United States ceased on January 1, 2010. Your TV has a NTSC Tuner according to Specifications on page 4 of manual.
https/www.manualslib.com/manual/510730/Sylvania-6427ff.html?page=4#manual
When the changeover was made to digital, convertor boxes were available with government discounted prices. Nowadays you may want to shop for a ATSC Digital TV Converter Box .
Function: Convert your Digital Broadcast to your Analog TV and Analog Pass Through (Antenna Required)