If I run two cables from the roof aerial, will both cable carry full strength signal from the aerial, or is the signal likely to be weaker than having 1 cable to a 2 port amp and then feeding each TV from the amp?
The cable is designed for a particular impedance at rf which matches the aerial impedance, for maximum power transfer of the signal. If you connect more than one cable there will be a complete mismatch and the signal will be badly degraded. The amplifier is the correct way to go.
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