Good to know that your DirecTV installer at least keep the cables
indoor instead of running the cables
indoor-and-then-outdoor-and-then-indoor-again.

The DirecTV installer grounded the dish to a metal rod that is also
being used as a ground by the power company.

I don't quite understand why this is bad not to cap those two unused
outputs. Are you afraid of dust getting into the connectors? How does
the cap look like?

Jay Chan