What OTA USB Unit to Look For, For a Hopper/Sling

I just a week or so ago Up-Graded to a Hopper With Sling.

Now I want to add the OTA adapter so I can insert my OTA signals into the Hopper.

This I'm seeing is simply a USB connected device that I just connect my OTA Antenna to, and then scan bla bla bla.

Now I know the whole story about Dish not having any at all anymore UG! And that you can still get them online like at Amazon and many others.

BUT......... And there always seems to be a BUT isn't there?

I am seeing many many different...

What OTA USB Unit to Look For, For a Hopper/Sling