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Is coax 75ohm stupid legacy for home use?

If you have some old copper coax inwall why not. I ripped it out when the parabola quit. Otherwise ethernet is the way to go, and for myself I use cable´d as much as possible. TV is whitout RJ45 so thats out the window. If I buy something new, I make sure it has proper contact options.
 
Do you use these? Reports I've read elsewhere indicate they are pretty good, but maybe not everything claimed. In some houses they might be a great option even so. I've used MOCA units over coax and those are great giving you ethernet speeds of 1 to 2.5 gbps depending upon which brand you choose. They are a bit more costly, but I've used them over old in wall coax from abandoned cable TV or satellite TV installations.
Short answer no. Longer story wanted to use my coax to my roof antenna mount that I used to use for FM that went to structured wire panel buried in a closet (65 ft of cable) and connect it to a new 5G Internet Air modem. But that was, in the end, not going work with long runs on 70 ohm coax and those frequencies. The person at Coaxifi was very helpful and knowledgeable. Searching around I found a number of posts that said it does work as WiFi extender but to many antennas to close to each other did cause issues. A run to your basement and one to a garage good, put them to close conflicts, for some, not others. That ugly Air hub is on a shelf in my third floor lookout and giving me 140 - 250 mbps when I used to get 6 with DSL and I use my own Ubiquity Access Point which is centrally located in my home. Almost everything is on a Cat5e wire because I went crazy with those when I remodeled our home and coax too. I still may try it attenuating the coax to 30 ohms but if take on any more projects I'll be sleeping in my car, according to my wife.
 
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