HD or not HD is irrelevant. The question is whether or not the televisions are digital (current broadcast standard) or analog (old broadcast standard). If they are analog receivers, no antenna will make them work. However, a relatively cheap and easy to install digital to analog converter will.
If they are digital ready, then the new antenna should solve the problem.
Old (usually dirty) Nissan Titan
Old (enhanced with "male pattern baldness") Sovereign
Young, lovely bride
Goofy dog, dismissive cat