I can not find a 30 foot HDMI cable that can handle my new 4K Apple TV at the Dolby Vision setting. I have verified that the rest of the setup is fine when I used a 6 foot cable yesterday. Now I need to stow the Apple TV in its permanent location.

I am using an Amazon basics high speed HDMI cable that is 25 feet. Works fine at all settings below 60hz refresh. Currently set to Dolbyvision 24hz as I only use the Apple TV to watch movies.

Also set the chroma setting to 4.4.4 ( higher one) that worked for me. If you absolutely need a 30 ft cable consider buying 2 of the Belkin 15 ft ultra high speed cables Apple recommends and joining them with a device called a repeater.

Hi. 30 feet is asking a lot of HDMI. Can't you mount Apple TV with the television? It's not very large, and doesn't need to be visible, since the remote is Bluetooth (optionally WiFi).

Alternatively, there are devices that will relay HDMI signals over Cat-6 cable. Not sure if they handle 4K, though.