I have a new DTV install being done next week with a SWM LNB, I also have Comcast cable internet. There is only one RG6 cable coming into the house. How can I combine the single cable coming off of the SWM LNB dish and the cable coming from the street into one cable outside the house, then inside the house separate them again. I understand that this can be done with a SWM8 and a diplexer, but because I will already have the SWM LNB dish I will not be able to use the SWM8. Any assistance would be very helpful.