>>105856833
>extending the antenna itself on an RF cable
Generally not a very good idea.
>>105854840
They are just being silly and not explaining it further while having assumptions on what people actually want to do with it. Having some arbitrary DNS service on your local network is one thing and advertising it on the router's DHCP messages is another.
(could make another video on DHCP that explained it)
>>105856833
>>105856955
>Wi-Fi bridge
It's called a client bridge, or "media bridge" by Asus.