Okey dokey; the 211K is the same one we've had for 3+ years. It has a single tuner and will only feed one TV or, as you all have found, multiple tv's viewing the same channel.
On our A.C.E., I installed a separate cable connector to bring the satellite feed into the coach to the 211K to avoid messing with the existing antenna and cable arrangement. The 211 is then connected to the TV using the factory installed HDMI cable. With this arrangement, we are free to use either the OTA antenna, an RV park's cable service, or our own Dish Tailgater.
Our at home Dish Hopper will feed multiple TV's using their Joey's at each extra TV, either hard wired or wireless. You might want to talk to Dish's customer service to see if those might work with the Tailgater.
Here's a link to Dish's FAQ's regarding the Tailgater: https://www.mydish.com/support/tailg...r-to-tailgater
Please post back your resolution and best of luck!!