Like all satellite systems, it's not possible to receive all the local channels by satellite transmission since thry're being broadcast using local broadcast antennas. There are many excellent antennas available that do a great job of receiving these local broadcast signals. Ask your C-Band TV professional for your best solution. When the dish is properly installed and aimed, it requires very little. You do need to keep your dish clear of snow and debris, since these can impede reception and even cause damage.
Satellite TV can already adapt to digital signals.