Look up internet,I found this.
If you want to use a TV antenna beside your DIRECTV, here are a few things you should know:
Your TV aerial is hooked up to the same TV as your DIRECTV installation, but the two are not interconnected.
To watch antenna TV, you’ll switch the input from DIRECTV to your OTA antenna.
While you can watch local TV, you won’t be able to record it with your DIRECTV DVR setup.
To record live TV broadcasts, you’ll need to use an antenna receiver with DVR capabilities.
The coax cable from the antenna should go through the antenna control box and hook to the coax cable that leads to both tv’s. Should work for both, but the best situation is to have the coax cable splitter hooked close to the controller.