Use a powered, amplified antenna. I have something similar to this in my attic, and I have the signal split among 5 rooms with a powered repeater/splitter:
https://www.amazon.com/WA-2608-Ampli...%2C113&sr=8-19
Point it at the correct direction according to this website. Click on the station names to apply them to the map, then aim the antenna accordingly.
https://www.fcc.gov/media/engineering/dtvmaps