Hi, I think your units model number is AJ6111. According to the
owners manual, the FM antenna is integrated to AC Power Cord. So you can not add antenna. But you can try to re arrange the cord and perhaps add an extension cord to see if reception gets better.
If this is not the unit you have, please try to provide the model number so I can look up the right owners manual and try to help you.
Good luck.
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