This item is in your cart because you selected the "I Do Not Need the SMA to FME Adapter" option when you added the Wilson 311133 antenna to your cart.
The 311133 antenna has an SMA/Male connector, so anyone who is using it along with a traditional adapter cable or any other item with an FME/Male connector will need the SMA to FME adapter.
If you DO need the adapter, you can add it via this link.