Omega B built in 1996 Radio antenna

Day with each other, as far as I know and have read, is the antenna of my Omega directly in the rear window and when I have read RIGHT it is the 2 vertical strips of the rear window heating. Now my question. Can one be installed separately another (real) antenna? Somehow I have the feeling, as soon as the rear window is plastered by rain or a few drops of washing is the reception for the ass? And then another question from pure Does anyone have a good recommendation about car radios? My FOH has already installed a radio, because mine was completely gone, but the current one only gives a signal for the right side of the driver, i.e. – I sit mostly in silence. Great would be a radio with CD / MP3 and USB, as well as a nice display lighting (blue or yellow). Moreover, it would be good if the wallet would not suffer so much.