I parked my car in a not so nice neighborhood in Chicago and somebody deliberately broke my antenna. I need help on how to install a new antenna and where can I get one aside from the dealer. Thank you in advance.

 

dealer item there is a 13 mm nut on the antenna remove it turn on the radio and pull out the antenna to install feed white plastic into same hole and have somebody turn off the radio start feeding plastic into hole then screw fitting beack into place once fitting is started turn radio back on. and tighten fitting