For sale Gemtronics GT-302 ADF receiver which covers Beacons (16 to 40mhz), broadcast band from 550 khz to 1650 khz, and marine band from 1.8 mhz to 5 mhz. It’s powered with D cells batteries. Would be ideal for locating noise interference. Had purchased for a project that never happened so no longer needed. Please contact me if you need more information or photos. Will look at all serious offers.