Here's a couple choices. You can try just the antennas, or the boosters and antenna together.
https://www.amazon.com/Sunhans...s=gateway&sr=8-3
https://www.amazon.com/Extende...s=gateway&sr=8-4
And higher gain antennas...
https://www.amazon.com/Extende...s=gateway&sr=8-4
Here's an antenna with a base so you can locate it higher in the room.