Use the following link to determine what GPS antenna adapter you need.
Enfig GAA "GPS Antenna Adapters"12
Featured positive reviews:
Enfig GAA "GPS Antenna Adapters"
Works as it’s suppose to
Various antennas that I’ve heard of typically only let you connect you to one antenna when in reality you need to connect both. After all in my case, my Audi is a dual antenna. This inexpensive adapter just does that. If you only connect to one antenna then you WILL end up with problems such as terrible radio signal,etc.