I don't see a lot of reviews on the CM 2016.

Is it a good antenna. It's VHF gain (2dB) is pretty low but I think it will work for my setup. The antenna will need to be attic mounted. I don't want to deal w/ neighbors and we routinely have hurricanes (not sure which is worse).

Specs for CM2016 (and 2018, 2020)
136287

Results from TVFool
136288

I am only concerned about the stations in the 309-316 deg (magnetic) corridor. All the stations are 12-15 miles away and show -25 to -30 dBm

Most of the stations are UHF (16, 21, 29, 31, 33, 40, 41, 46, 50) with one station staying on VHF 13.

The bad news is that VHF 13 station is the weakest.
Is 2dB of gain enough to reliably pull in 13 w/ -30dBm power?

Since all my stations are along such a narrow angle (all stations within 7 degrees) should I get an antenna with more directionality? The 2016 is omni in the VHF band. I don't really need the range but would a 2018 be better for narrow beam width.

Most comments I've seen on the CM 2016's performance are positive, but they've all involved outdoor installations. Attic antennas face a minimum 3 dB penalty under the best circumstances, and no antenna will work in an attic where it aims through ductwork, a tile roof, radiant barrier, stucco/aluminum siding, etc. If none of this applies, the 2016 would probably be OK for one TV, because those stations (including the ABC affiliate) are quite strong. The higher-gain 2018 (or its less-expensive, but just-as-strong rival, the Winegard HD-7694) would offer peace of mind -- as well as extra capacity for adding another TV or two in the future without having to amplify the signals.

A directional antenna is a good idea if there are any tall buildings, towers, etc. nearby that might reflect signals and cause multipath interference. Multipath is the source of ghosting in analog reception and dropouts or freezes in DTV.