[ADTech]

The selection of the 91XG for the Boston stations (only) for your area is fine, however, its selected mounting location is the problem. Not only is the 91XG appropriate for deep fringe operation, it is also appropriate for suburban usage in multi-path environments due to its narrow beamwidth. If one believes that the gain is too high and that it might overload a tuner, adding an attenuator (6-10 dB) is simple matter. Since most tuners can handle signal powers up to about -5 dBm, there is zero risk of overload in this location from TV stations. The strongest signal on the plot (WUTF) is more than 50° off bore sight and the antenna's gain at that angle should be slightly negative.

The TVFool plot given is imprecise in its location so it is, at best, a rough estimate, as it was done at the block level. The OP's actual location might be several hundred yards away and the location might be further behind that hill than calculated. Additionally, the antenna in the attic may well behind trees which are extremely deleterious to UHF signals.

1. Try various spots within the attic. Sometimes, a mere 6-12" of movement can make or break reception.

2. Get the antenna out of the attic, up in the air, and situated as bar back away from any trees as possible.

3. Bore sight the boom of the antenna to the visible horizon in the direction of Needham, then re-adjust as needed. If you are behind that hill, aim the antenna at the "shoulder" of the hill , then probe for best results.