The DB8e is a great UHF antenna. Replace your VHF retrofit with one of these pointed at 203ish to get 6, 9 (maybe from the back), 12, 7, and 13.
http://www.mcmelectronics.com/product/30-2476
If you have a phone or a GPS, run a tvfool report from the coordinates of your antenna. Run it at 15-20-25-30' agl to see if height makes much of a difference for channels you want.