You may run into problems with existing cable. Sat signals are stronger than OTA and the existing cable runs may be too long, or split into too many different runs for your antenna to be able to push the signal through.
Sat signals aren't usually affected by this enough for the typical home install to be a problem, but often are for OTA reception.
I tried to use my existing sat cable runs in my house when I switched, but got very poor performance from them. I wound up replacing it all with new, shortest length possible runs and reception improved greatly. By greatly I mean 30% more channels and better quality signal, just from replacing the cable and splitter.
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