Weather boots are what I call "funnels".
Directv, for one, has moved to what are called "thread protectors". They're a rubber sleeve that fits over the outside of the female F-connector. When a standard compression fitting is attached, the lip of the compression fitting goes inside the seal, then the rubber compresses at both ends to form an environmental seal.
We started using these on our new Juice amplifier. I find them to be extremely effective although a PITA due to the requirement of always needing a wrench to tighten (almost all the way) the nut of the compression fitting.
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