Search turned up what I've already got: Looking for wrench/tool for TV cable that has a collar at the connector nuts. The tool I have won't fit over the collar on the new TV cable I had to get.
I know exactly what you want but can't tell you where to find it. It's a plastic handle on a 1/8" steel rod with essentially a 7/16 open end on it. Those collars on both F and some BNC are a PITA in limited access area. The BNC tools are made by Trompeter.
