The black tank flush back flow/anti-siphon valve is an often discussed issue.
Many leak, many won't flow water. There have been several posts where it has been eliminated and replaced with a check valve behind the connection. I'm not sure that meets manufacturing code but you won't have water all over your floor.
If your antenna is the crank-up Winegard type, stick with it and simply buy the replacement parts necessary. There are lots of reports on the omni-directional antennas not working well.
As suggested, please do not stream Netflix or other streaming tv services over the campground wifi unless there is an option from the campground to purchase increased bandwidth. Streaming tv uses enough bandwidth that if even a handful of folks in the campground stream tv, there won't be any bandwidth for others. If you simply can't be without streaming tv on a camping trip, get a mobile hot spot as mentioned.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel-Goodyear Endurance Tires
2017 Ford F-Series SCREW 4x4 - Factory Puck B&W Companion
TST Tire Monitor w/Repeater - Sinemate 3500w Gen.
Days Camped: '17=30 ☼ '18=51 ☼ '19=58 ☼ '20=83