For RG-6 cable most of the fittings are not water proof. They are fine for indoor use. Make sure for outdoor use you get the crimped fittings with silicone gell in the end that goes over the cable and an o-ring inside the nut end. The nut on the water proof fittings is a little deeper to accommodate the o-ring. Make sure to get a crimper with the hex shaped crimping jaws for proper compression and squeeze for sealing. A small amount of silicon may ooze out around the cable indicating a good seal.
I got my
crimper and used to get the fittings at Radio Shack (2 for $1.00). I found a new source for the water proof fitting but can't remember where at this time. I'll have to look in my box where I keep everything to look at the packages.
For satellite use the outdoor cable needs to be water proof because the receiver sends power to the dish. That is also why the center wire is slightly heavier than the wire in the standard RG-58 and RG-59 cables.
I'm not an expert but I have wired 3 houses for both satellite and outdoor tv antenna and made outdoor cables for both of my TT's and made up some cables a few friends so I do know a little about it.