I believe that there are some cable systems in the Lakes Region of NH (Laconia, Wolfeboro, etc.) that carry all of the Boston and Portland affiliates - plus WMUR Manchester (ABC) and WUNH Durham (PBS). That would mean that they too have 3 ABCs and 3 PBS affiliates.
Here's what Metrocast in the Laconia area caries:
ABC - WCVB Boston, WMTW Poland Springs/Portland, WMUR Manchester
CBS - WBZ Boston, WGME Portland
NBC - WHDH Boston, WCSH Portland
Fox - WFXT Boston
CW - WLVI Boston
My - WZMY Derry
PBS - WENH Durham, WGBH Boston
To summerize, they leave out all but the big 3 from Portland, and they carry everything from Boston except for WGBX.