said by robbin:You can get a higher resolution broadcast off of an air antenna than the compressed signal off of cable. If you have both an antenna and cable hooked up, you may be able to see the difference depending on the program. It is also nice to have an antenna hooked up if the cable system goes out due to a storm, etc.
He's from Canada which still has a lot of analog stations. Also if he got the TV in Canada I'm not sure the TV even has a ATSC tuner in it. A model number would help a lot. Also knowing his cable Tv provider would help too.