Frustrating when connecting to a normal dump1090 instance. They worked well for Stratux. But their marketing claims of "high utility" are dubious. I have **much** more contacts with a simple 69mm quarter-wave pin on a small magnetic mount that sits on top of a piece of metal that serves as a ground plane. Save money. If you have an extra antenna/mount from a cheap Freeview adapter, cut the standard antenna down to 69mm and attach this magnetic mount to a coffee can lid (or metal at least 69mm radius from the antenna).
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