Antenna Use with Apple TV

An antenna would need to be attached to the TV. However, there are also other solutions, like HDHomeRun, where you connect the antenna to their device and make it available to the network and then you would be able to use an app on Apple TV to view it.

https://www.silicondust.com

You would attach it to your TV.

No.

There is no TV receiver in an AppleTV.

if your local channels have an app in app store you can download that and view their content, my local channels have both live and traditional streaming in their free app in app store