Radio Direction Finding – also known as fox hunting is a fascinating activity with amatuer radio.

What radios work best for this?
Depends on what bands/modes you are trying to use. Most direction-finding events are done with 2 meters.

What antennas work best for RF direction finding?
Generally, yagis are the best for that. Many hams enjoy building a 2M yagi antenna with PVC and a tape measure.