Many, many hams use 75Ω coax. I have for decades. All of my outdoor coax is RG-6 or RG-11. In the past I have used larger 75Ω CATV hardline, which has even lower loss.
Many hams just accept the 1.5:1 VSWR caused by the small impedance difference. I fed a 50Ω 2m array with 75Ω coax using a very simple matching arrangement, using two short pieces of coax at the feedpoint; one 50Ω and one 75Ω. (I can't think what it is called right now).
In fact, the feedpoint impedance of a center-fed dipole is 75Ω! It is only 50Ω at one low height. Feed a resonant dipole with 50Ω coax, and you actually have a small mismatch!
The power handing capability of RG-6 is almost identical to RG-213. And even at the legal limit, the voltage is still low enough that flashover will not occur between the center conductor and the shield even with a mismatch.
The thin copper plating on the RG6 cable centre conductor may be a problem at HF but for UHF it should be ok
K4KYV, myself, and others on the Topband reflector measured it. The consensus was that at 80 meters it made no difference, and at 160m it made a little difference but it was still insignificant.
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