the 'CABLE' coax input connection is generally in the WET BAY compartment, sometimes at the top of the valves and water controls, and sometimes in the ELECTRICAL Shore Cord bay, depending on your model.
You don't need an 'antenna booster plate' for CABLE, and since the 'entertainment box' or similar device in the coach handles the 12v needed for OTA antenna viewing, you won't have a 'booster plate'.
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