One thing at a time, the existing co-ax from sat, can be reused, normally very good cable.

The other questions, from your location, stations are in all directions, to get all, an outdoor antenna with pre-amp on a rotor is the only option. Otherwise, with some testing and "fun", look at the map, see what channels you get now AND which ones more you would like.

Then start doing one thing at a time. I would look at using an outdoor pre-amp and antenna to get the distant channels in one direction, eg Toronto, run co-ax into house, and After the power inserter just before tv, place a two way splitter and combine your locall indoor antenna with the outdoor one, to your tv AND see what happens.

Keep in mind Toronto is very hard to get, CN Tower blocks signals to the south. Check with others in your area about their successes.

Have fun and good luck.

PS: Any good 8 bay antenna covering chn 14 to 69 should work, Toronto chn 9 is actually on chn 9 rf VHF, not available on UHF bow tie antennas.