Completely legal, free channels. The antenna used in this video is a Winegard FlatWave HDTV indoor digital antenna.
Amazon Link: http://amzn.to/1LjUVLq
In reference to the quote "in better quality than high def" -This is in reference to high definition tv channels coming in off the air through the antenna are of higher quality, due to less compression leading to less pixelation and artifacts, compared to high definition cable tv from your cable provider
In reference to the quote "in better quality than high def" -This is in reference to high definition tv channels coming in off the air through the antenna are of higher quality, due to less compression leading to less pixelation and artifacts, compared to high definition cable tv from your cable provider