Need antenna for radio/Panasonic CD Stereo model SA-PM29

Hi,

I have a Panasonic  CD/Stereo model SA-PM29.
My cats took the stereo antenna which I need to use FM radio tuner. It's just a wire going into back of of the stereo.
Ive stuck wire in there to get reception. It doesn't stay in.
Do you know where I can get a replacement?
Do you know this old model and what is current and similar?
Thank you and best wishes!
Judy