When measuring the resistance in a through outlet between the input and the TV connector, the tester indicates that there is a short-circuit.
Is the outlet defective?
Many elements in TV and IF signal distribution networks are inductive.
Coils and transformers are regarded as short-circuits by a multitester.
You need to remember that a coil is regarded as a short-circuit when working with the Vdc voltage.
This does not mean that the element is defective.