Thank you for your thorough response. Those antennas are enormous and may cause marital issues.
After posting my question, I realized that I can livestream WGBH with the PBS app. Since other Boston stations are redundant with Providence, let's focus on getting the Providence/New Bedford stations:
10-1 (25) WJAR (NBC) - 75.8°
6-1 (24) WLNE (ABC) - 75.8°
64-1 (12) WNAC (FOX) - 74.1°
12-1 (7) WPRI (CBS) - 74.2°
36-1 (2) WSBE (PBS) - 75.8°
and whatever subchannels are transmitted with those stations.
If I understand properly, we're now dealing with only 2 UHF channels and 3 VHF channels, all within 2° of each other.
Eric