Removing mob phone antenna from window

Hi all,

Does anyone know how to remove a mobile phone hands free kit antenna from the back window? It is the type that has a section stuck to each side of the window and somehow connects through the window. I am removing the kit from one car and intend fitting it to another if I can.Everything is out except the antenna.

I wondered if a heat gun may be the go? Or some sort of solvent perhaps? Obviously it needs to be done to both sides of the glass.

Then will it be reusable?

Thanks in advance for replies

Cheers
Trev