When I first cut the cord from cable tv, I only got about 20 or so TV channels over the air.
By adding a High Gain Antenna and signal amplifier, I now get over 60 channels of HD over the air, for FREE. Everything it took to set it up cost less than $100 and took no time at all to setup.
Here are the 2 things I added to my setup:
TV Amplifier: https://amzn.to/2Wcdha4