Barry VanDusen and I visited the Cumberland Farms in Halifax, Massachusetts, on an overcast and quite cool fall day. The bird had been seen before we arrived mostly at the south end of the crescent shaped drainage area east of the model airplane field. Click this link
to see a Google Map of its location.
The bird can be quite mousy. Many of the birders present felt it was like looking for voles in the grass as it literally went under the grass and would pop up some distance away.
We had our best luck following the advise of Barry Burden who suggested we should walk around the area rather than sitting in one spot. He was right. As we walked around, the bird would pop up, but not in a frightened sense, providing great views, some from as little as 6 feet away. We found the bird mostly in the center of the crescent shaped area, both in the dried and matted Phragmites next to the water filled ditch.