What is the difference between a tuner and an antenna?
An antenna is an aerial. A wire structure which, to pick up TV signals, is typically mounted at the highest point in a house and connected by a coaxial cable.

A tuner is a circuit that selects a particular signal from all those received by the antenna. Typically this is by tuning to a specific frequency.



Some small portable TVs do have a small antenna as a part of them, the older ones would take the form of an external wire loop with or without telescopic elements. I'm not aware of TVs with completely internal aerials. Perhaps they exist but I imagine reception would be very poor.