Why Hidden transmitter hunts (fox hunts, or radio direction finding) work by determining the bearing to a signal and then moving toward it. That requires an antenna whose response changes with direction, such as a small Yagi, a loop, or a tape-measure beam, so you can find the peak or the sharper null that points at the fox. Combining bearings taken from two or more locations triangulates the transmitter's position.
Watch out SWR meters and directional wattmeters both measure power flowing in your own feed line, forward versus reflected, for tuning your transmitting station. They tell you nothing about which compass direction an incoming signal arrives from.
To find a direction you need a directional antenna. Meters measure your own power, not the fox's bearing.