I have a new HiDef receiver, I am tring to send a signal to an addtional TV. It only has 1 Sat In Terminal and one Air Ant Terminal and RCA connectors. I would like to send a signal to an addtional TV. I was told by the tech who installed it that it could be done with an RF Modulator. The RF Modulator has TV in and out terminal along with RCA connectors. Can this be done and if so, how?