On my 2012, there is a cable TV inlet on the driver's side next to the macerator pump and dump valve switches. When I hook up, I've got to leave that door open, which leaves the switches exposed to precipitation. I haven't figured out a work-around to provide weather protection while cable is hooked up.
If memory serves, the cable connection on the curbside rear is a cable outlet, not inlet, so that you can use your onboard antenna with a portable television. But since I don't carry around a portable television I haven't used that outlet to confirm my memory.
Engineering: Finding complex solutions to simple problems you didn't even know you had.