I recently acquired two Realistic DX-100 receivers and one of them came with this antenna in the box. The connectionon it doesn't fit on the receivers which leaves me to believe the person who sold them to me had no idea it didn't go with them. Any ideas on what type this is? Theres no markings on it. It looks like a shortwave antenna from the websites I checked. The seller claimed it was a HY-Gain but I can't find anything on their site or past catalogs.