There is NO such thing as 'Digital Antenna'.........doesn't exist.
A wire coat hanger can be used to receive OTA digital signals provided the TV has a digital tuner or a analog to digital converter is used.
OTA digital signals are transmitted on a narrow beam. THe higher the old antenna is the better the chance of reception.
Aiming the antenna towards the TV Transponder towers the better the chance of reception
The closer one is to the TV Transponder Towers the better the chance of reception
The Windgard Sensor Crank up amplified antenna is the best for reception of the OTA TV signals
Several websites available to find towers/distance and direction to aim antenna