wifi and tv upgrades?

Upgrading the TV's is a carpentry/cabinetry job for the most part.. See a good cabinet maker

As for the Wi-Fi.. Wi-Fi Ranger is one of the most popular devices, the full system consists of a Router that goes INSIDE your RV, and a "Modem" (Wi-Fi adapter) that goes outside the RV.. You can also do some tricks to increase the "Gain" of the antenna part if you like.. (View early episodes of Amaturlogic.tv for some idea including a Grape Juice can or Coffee can, and a re-purposed Sat TV dish) These improvements are optional and require NO electronics knowledge. Oh, early episodes #3 specifically, and one later, not sure if it's 4,5 or 6

I used to buy these for ...........$36. No need to mount outside.

You might want to take a look at the following as a possible solution

Private RV WiFi for under $100

Thanks for this!

Any B-Ham RV Dealer should be able to give you references to get your needs taken care of.