: It categorizes stations by signal strength (e.g., strong, moderate, weak) to help determine the type of antenna needed (indoor vs. outdoor). Amazon.com Antenna Aiming Support
The map provides estimates based on a "terrain-sensitive propagation model". It assumes your antenna is outdoor and 30 feet above ground level, so indoor results may be weaker. dtv gov maps
ATSC 3.0 requires a new tuner or converter box. You cannot receive a "Good" NextGen signal on a 10-year-old TV without an external box, regardless of what dtv gov maps says. : It categorizes stations by signal strength (e