The SDS 100 comes with a cheap ass SMA adapter. When I removed the antenna, the damn antenna housing would loosen.
Someone told me about this little tool. I forgot what this is called, but it might be an "e wrench." I searched many places & finally found it on Ebay. However, when I used that crap SMA adapter from Uniden, I had to frequently tighten the antenna housing.
I solved this problem by buying a proper SMA adapter.
BNC to SMA Adapter – SDS100 – GOLD – Airspy.US
Since I bought this tool & SMA adapter, the antenna housing hasn't loosened.
If you buy one, don't overtighten. Before I bought this tool, I used a pair of needle nose pliers. It was hit and miss.