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I've had very good luck tracking down RFI using an HT with AM receive and a dualband handheld yagi, Helps greatly, it the HT has an attenuator. You can damn near pinpoint the source. Only other thing that's more accurate, would be an ultrasonic locator with a parabolic reflector. Tune the HT down in the Airband portion. A regular AM radio with a good quality internal bar antenna is a good tool, too. You can locate the direction of the source by nulling the signal by turning the radio. Once you get a heading, then use you HT to track it down. These techniques work good for noise in the higher bands, but the source on lower bands can be very far away. You would need to use an oscilloscope to capture the signature in your shack, then drive around until you pick up the identical signal, which will be your source.