Before I upgraded to the Etrex Vista I used the GPS12XL for some years. And while the GPS reception in my car is very bad with the receiver mounted in an easy-to-read position, I used the GA27 antenna put on the dashboard. Now, the Etrex family does not come with a connection for external antenna. There are some re-radiating antennas on the market but I found a way to save this money, using the old GA27.