The antenna came with basically no mounting hardware, just these two u bolts. I’m guessing I got shorted some parts?
You need an antenna mast or a J-mount for it. Or screw it directly on a 2x4 wood member.
Installation by iboscolo http://discussions.flightaware.com/post204619.html#p204619
There should be a bracket in the package that the antenna fits into and the u-bolts screw onto (like in abcd’s photo). If you’re missing that then yes, you’re short some parts.