Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
Why An antenna analyzer is self-contained: it has its own low-power signal generator and impedance/SWR detector built in, so the only thing it needs is the load you want to measure, meaning the feed line and the antenna at its far end. You disconnect the radio and connect the antenna system to the analyzer's port, then sweep frequency to see where SWR is lowest. In fact the transmitter must stay disconnected, since RF from a transmitter can destroy the analyzer's sensitive front end.
Watch out Connecting a transmitter is the tempting answer because that is how an in-line SWR meter works, but an SWR bridge needs an external RF source while an analyzer supplies its own and can be damaged by transmitter power.
The analyzer is the transmitter and the receiver. All you add is what you are testing: feed line and antenna.