I think you should do better. Have you considered upgrading your antenna? Have you looked at TVFool? Post your TVFool link if you don't mind.
Plugging Norwich Connecticut into TVFool.com, I see you have UHF and VHF stations. Your antenna may not be well suited to the VHF stations. Maybe an inexpensive Y10-7-13
will get you a few more stations...
VHF: WEDN/9 (PBS), WTNH/10 (ABC), WNAC/12 (FOX), WPRI/13 (CBS)
Point your antenna to 73 (12/13) and you should be able to get 9 from the back leaving 10 shakey.
UHF: Your strongest channels are both ION (WHPX at 235 and WPXQ at 98). Point your UHF to 52 and you should get WHPX from the back.
So, you should be able to reliably pull PBS, Fox, CBS, and ION. Maybe ABC via VHF (WTNH) or, more likely, UHF (WCVB).
Given the scattered arrangement of broadcasters, you would probably be a great candidate for a DB8e plus a Y10-7-13 coupled with a CM7777.Edited by wizwor - 2/7/13 at 9:43am