That could be done. You'd need an array of at least six antennas, maybe eight, spaced evenly around a horizontal circle (60/45 deg between each). Then you'd need the hardware to pull in the signals through the multiple channels, and a hardware/software combo that would allow real time comparison of the signal strengths. From that, you should be able to calculate a clean bearing to the threat emitter. On a large vehicle, you might mount two arrays, one at each end of the vehicle, and using the different bearings reported by each array, triangulation to a specific emitter location would be possible.
Alas, you could probably buy a nice used F-16 for what such a setup would cost. A couple hundred years of no tickets, and this lashup might actually pay for itself!
Alas, you could probably buy a nice used F-16 for what such a setup would cost. A couple hundred years of no tickets, and this lashup might actually pay for itself!