Cliff, I installed a lot of those hole feed thru's and caulk or silicon seal is a must.
They also make them for "one run" flat satellite cable too.
We used to call them "bum plugs".
They come RG 59 size.
2 colors as per above; White & black.
They wholesale for >.25 ea. typically.
IIRC they may have also come in 2 sizes also.
There was also a couple of alternatives.
One was a flat ribbon used to run the wiring under the bottom of a window. It had an F59 fitting on both ends. Worked super!
Then there was one that required you to drill a hole thru the wall, and inserted a plastic tube thru the hole. A cap went on both ends to keep bugs and water out. They were made for twin lead and coax.
(Then before I knew they existed, I simply drilled thru the wall, and ran a piece of plastic pipe thru the wall.)
of course, for the REAL electronics antenna nut, you can do like they did in the 30's and drill a hole thru the window glass, and put cone insulators on both sides with a brass/copper/ bronze/ alloy "bolt" running thru the center of the insulators. The same type insulators with a longer bolt were also used to go thru a hole drilled in the wall.( More military style).