My satellite box is capable of receiving RF signals on it's own via an antenna hookup on the rear of the unit. This is how I have been controlling the box when using the RCA remote.

Now I have the TSU3000 and want to know if I need the RFX or can I get it to work without it since the box is able to receive RF signals on it's own. Don't want to spend $100 if I don't have to.