DISCONTINUED - Links below to Alternatives

Here is a very similar antenna setup for cheaper on Amazon.  You just need to buy both an antenna and coaxial adapter to connect up to RaceCapture systems.

Wlaniot Omni-Directional Antenna

Coaxial Adapter

Windshield Mount Cellular Antennae

Description

This is an economical, compact windshield-mount GSM antenna designed to work with RaceCapture/Pro and PodiumConnect telemetry systems.  Great for completing a permanent installation!

Gain: 2.5dBi
Cable: 3 Meters, SMA connector
Windshield mount (mount 2″ away from metal edges)
For RaceCapture/Pro, RaceCapture/Apex, and PodiumConnect systems with reverse-polarity SMA connector.