Here at my low-noise country lair the storage shed I use for my ham radio shack was going to get very cold now that winter is coming.
I've had a carpenter insulate and line the space and a challenge was figuring out how to connect radios to antennas.
Ross, EX0AA, suggested SO-239 bulkhead adapters:
I asked the carpenter to create a lined port to the outside and I've mounted a plate on the inside wall like this:
On the outside I've mounted a hinged plate to keep rain out of the cavity.
Underneath coax can connect.
The gaps around the port were filled with expanding foam filler.
With some, rather off level, shelves; the shack is now working well.
The concrete floor needs a bit of carpet.
Last night I joined the Macedon Ranges Amateur Radio club 80m net. It was 10C outside but, with the help of a small heater, it was a toasty 22C inside the shack.