When I installed a media server in the front of our coach, I was able to run a one-way HDMI cable about 30 feet to our rear bedroom TV, but try as I might (and I tried) I could not figure out how to snake an HDMI cable out through one of our slides to our outside entertainment center.
I've never been a fan of going wireless when it comes to HD TV, but since I couldn't figure out how to run a cable, I ended up installing a wireless HDMI transmitter/receiver that's branded "Actiontec" https://www.amazon.com/Actiontec-Wireless-Transmitter-Receiver-MWTVKIT01/dp/B00LSS10PM
It costs about $150.00 and it has worked perfectly for nearly two years. There are cheaper systems out there, but this one got pretty good reviews. In our setup, the receiver is only about 10 feet from the transmitter, which partially explains why it works so well, but it has never hiccuped once. Very happy with it.
Kev