I'm not using a USB rtl-sdr.
My antenna run is too long as it sits, adding to why I want it moved higher and closer
All you want to do is run a stream? Get yourself a Raspbery Pi ($35). They run cool and should be quite tolerant of temperature changes.
Let's see, a feed requires an antenna, coax cable, radio or scanner, audio cable, computer, and ethernet connection. So you will need your radio in this same environment. You could try a longer audio cable to a computer in a better environment.
I think that I would try plopping a RPi on top of a scanner in the attic with a wifi dongle to the router. I have two pi's running feeds currently without one ounce of trouble. They can be challenging to set up and to get good audio but there are others here who will help out.