It depends on what the previous owner did to it.
I have a 3585 and when I wired it for DTV it did nothing to the antenna signal.
What problem are you having?
If no signal, be sure that the over the air signal booster is turned on.
And you will have to tell your TV where to get the signal from. IE HDMI-1, HDMI-2, Ant, Cable.
Then you must to a channel search.
Peace
Dave