If you need to route video around the house - your best option might be to use a dedicated Cat6 or Cat5e cable.
NOTE - This is not a networked Ethernet connection - with these specific adaptors you can't send the HDMI signal via a router, a switch, an Ethernet over power-line connector, a WiFi transmitter, etc - you're just using a Cat6 (or CAT5e) cable as a substitute for a HDMI lead. The benefits are that you can have a longer cable run and the cable is easier to route through small holes and conduits.

There are more capable (and expensive) options available in this range of HDMI extenders if you need to send UHD HDR video. The full range is on the manufacturer website https://www.orei.com

My AFFILATED Amazon Links for this, the cheapest model in the Orei video extender range
UK https://amzn.to/4alf2rZ
US https://amzn.to/3TZFthc
DE https://amzn.to/3TDAVvE
CA https://amzn.to/4cE3JNb

Also here’s that cheapo Network Cable Tester - https://amzn.to/3VLpYLo (UK AFFILIATED LINK)

Some have demanded to know why I didn’t move the cable co-ax into the lounge. Firstly, don’t worry so much about my situation, I’m demonstrating a piece of tech, I’m not asking anyone to move in. However the reasons for not wanting to move the co-ax are as follows
1) The co-ax cable is still needed in the office room where it connects to the router and in turn distributes internet to the whole house. I don’t want to move the whole router set up. It works well where it is.
2) One option then might be extending/splitting the broadband co-ax and sending it to two rooms, however this is something that would have to be done by an installer allocated by the cable company and that’s a hassle as well as an expense.
3) There’s no easy cable path from the cable termination box outside to the back of the TV area. Installation of the Sky satellite cables between the same two points twenty years ago involved digging up the bitumen lounge floor - and that’s not something I’m prepared to go through again.

For the sake of £36 for these boxes there’s no engineer, no disruption, no big bill and zero hassle. Frankly you’d have to be a maniac not to go with this option given the choice and especially so when there’s an unused Cat6 cable already connecting the two locations.

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