The digital signals are line of sight, you need to have your antenna lined up with the broadcast line. The old analog signals were scattered and easier to pull in even if off the broadcast line a bit If there is a barrier of some kind, such as a mast
, then you will have signal loss.
There are antenna "boosters" to help widen the signal reception
area, most look like a wire rack. They do work, but are "tuned" also. Life is good if all the stations send their signals from the same tower. If not you need to rotate your antenna to pick up each one.
The over the air signal is really sharp, getting it takes a little work.