GPS Antenna - How to Improve Your Navigation with a GPS Antenna Most GPS receivers have an antenna built in to them. The two most popular types of antennas used in GPS receivers are "patch" and "quadrifilar helix" or "quad helix" for short. This page addresses external GPS antennas which are normally used when stronger satellite signals are needed.
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GPS is a nifty piece of technology. GPS hardware needs to have a clear view of the sky because it's satellite based, so using your handheld unit can be a problem when the roof of your car is blocking signal reception. How-To: Add your own external GPS antenna