You can get local channels with an antenna if you can install one. Not only will the prime channels be uncompressed HD but you will also receive all sub channels that dish does not carry. You would need a separate cable from the antenna to the TV 'ant in' jack. Use TV remote 'input' to change from HDMI1 to TV when you want to watch locals.
You would need to have a USB OTA module(tuner). You would connect your antenna into this module, and then the module to the hopper. What is your zip code, and what orbital locations are you showing that you have?
I do show you should get HD locals and what I want to do for you is check the account to see why you're not getting them. Please PM me with the phone number to see what Arc you have (Western or Eastern).