I bought a 1968 model 20-1075 which was an auto radio tunaverter, and no one seems to remember these units. This particular model converted one's car radio signal from am to fm in the hi-band range 150 megahertz + range. One other manufacturer was tompkins tunaverters by Salch Co. from Texas. I might be the only one in the whole US that has one. It hooked up in-line to a car radio thru an antenna cable and converted the signal to fm. There were others that could pickup cb, air, low band , uhf and even ham bands. I'd give just about anything to anyone that has one for sale, knows how to fix them, or has a schematic. contact me at stevexo@verizon.net in Md.