Hi, there are literally so many variables when it comes to free-to-air tv reception, so you're going to have to try harder.
For starters, what country do you live in? Do you have an external antenna on your roof etc? Can you confirm that indoor digital TV antenna's even work in your house/living area? Does the antenna you purchased have a power supply (ie. boosting the signal)? In Australia, digital indoor TV antennas are almost a complete waste of time unless you live in a metropolitan area that has great TV reception. You're quite vague on the details here..