Garmin GPS Antenna (new)
 

I have two garmin GPS antennas. One was for a garmin weather gps and I bought the wrong one (Garmin GXM31) paid 230.00 from defender. The wiring was run but that is the antenna was never powered up because the hook up was wrong... $190.00 shipped
http://www.defender.com/product.jsp?path=-1|344|302025|296556|321042&id=778881

The Other is a Garmin 17 X I bought it for my Livorsi GPS speedo but it wouldn't work with it. Again paid 190.00 from defender. Will let it go for $140 shipped. Hooked up and then removed. its as good as new.

My mistakes your gain!