I have a Garmin GDL 39 ADS-B Receiver that I use in my LSA for traffic and weather. I charge it up and set it in the back window where it works reasonably well. My problem is that the stub antenna on top has broken off and I can't find a replacement anywhere. Garmin is no help. Spruce USA doesn't have them. This appears to be a common problem with GDL 39s as I see many of them advertised on e-bay - without the top stub antenna. I believe there is an external antenna available, but it is advertised as a GPS antenna and Im not sure it would work to receive ADS-B data? In any event, I would prefer the stub antenna that doesn't have a coil of wire laying about. It does still seem to work with what's left of the old antenna, but I'm not real sure I am receiving all the data available in that mode. Anyone have a source for them in the US? (I do see them listed on European & Chinese websites, but don't trust those).