14158 Brand new and high quality Easy to install Connect it inline with your antenna and connect the blue wire to your power antenna lead or another keyed 12V source Work with AM and FM Radio Stations With Motorola Female and Male Ends Many of the Newer Audi， BMW， Mercedes and VW vehicles come stock with an inline Booster similar to this one but they have European ends With this item， you can have great reception as well Less radio drift and improvement in both FM and AM reception Note: The main function of this antenna is to filter waves and enhance signal concentration. 1 x Car FM AM antenna