Somebody mentioned using twin lead, I'd not consider that a viable way to go any more except for the shortest runs. Most antennas and all T.V.s and digital boxes are designed for 75 ohm coax and even using proper transformers to convert impenances, those are pretty lossy, so there is no advantage to twin lead except it's cheap.
In some cases /areas, you might need two antennas pointing to two different transmitter locations. I don't know for sure but I bet somebody makes a conbiner to mix signals from two antennas together and keep proper inpedances. Tom WA6IVG
