Give your a boost with this external active antenna. This GPS antenna draws about 10mA and will give you an additional 28 dB of gain. It's got a 5 meter long cable so it will easily reach wherever you need it to. The antenna is magnetic so it will stick to the top of a car or truck (or any other steel structure) 

Comes with a standard SMA connector on the end and an SMA to u.FL cable assembly to connect it to an Adafruit .