I have just bought a TV for the basement. The Bell receiver is a 2700 and is connected to the main floor TV with RCA cables. We connected the downstairs unit via co-axial cable to the back of the receiver but when the main TV is on, we get no signal to the basement TV. If we turn off the main floor TV, we get video downstairs. I'm fine with the fact that both TVs will have the same channel but can I have both units running?