One example. The antenna installation on my CX-5 the mount with cable was only was available with an SMA connector on the end. There was another one, with the mini RG8X cable connector on the end, but it was too short to make it from the roof rack mount to inside of the rear hatch. I wanted to go to some mini RG8X cable, as an extention, that only had RG8X connectors. All I had on hand was SMA to BNC. Had to use the higher loss RG-58 extension cable until I can buy the adapters I want at the Dayton Hamvention this weekend.