The
FCC had no compassion when they switched Analog television VHF for Digital television UHF.
About the only thing you can do is buy a good outdoors antenna and mount it as high as possible and buy a antenna rotor because no one position is good enough to pick up every station in your viewing area.
The
FCC went as far as to give away money to people so they could buy a new converter box, if they could not afford a new television.
There was nothing left for free antenna's and installations.
You might find that the Canadian stations might be as strong as the USA stations in some situations.
What kind of antenna do you have and what kind of wire did you use and what kind of converter box are you using. Where is this antenna and where do you live.
Rochester NY is a pretty big place, with lot's of tall buildings and stuff to block your signals.