Yes and no. I usually use the body-shielding technique: Attenuate or reduce gain until the signal is faint. Hold the receiver against my chest and turn in a slo

Yes and no. I usually use the body-shielding technique: Attenuate or reduce gain until the signal is faint. Hold the receiver against my chest and turn in a slow circle until it disappears entirely. Now I know the transmitter is behind me. It's crude, but expedient, and fairly effective. This has the advantage of working with any receiver type, any antenna (it's actually particularly good with the otherwise-useless rubber-duck that cheap HTs ship with), and any signal with a wavelength longer than my torso is wide, -ish. It falls off gracefully at the limit there. Would better gear produce better results? Sure, you'd almost certainly beat me to the fox if you had that stuff sitting around. But I'll be knocking on the guy's door while you're still soldering. Incidentally, anyone who's been playing with TPMS decoding probably has a 315MHz-specific filter kit sitting around. It works okay-ish without that, but it gets truly creepy when given a good filter and antenna. SAW cans for 315 and 433 are about $4/ea.