There are no markings on the balun. I remember the ham telling me that the balun and antenna were made by a long ago defunct company out of Lynchburg, VA. Some long gone electronics company. I forget what the antenna was called. The coating on the wire is blue and the wire is 43 feet long. This is not a store bought antenna and it is decades old. I will try and contact the ham to get more info on it. I do not have any sort of swr/watt meter. Just the meter built into the ts120s. The radio nor my autotuner have the ability to connect a bare wire antenna to it....only the 50 ohm coax 239.