Wifi radios are generally designed for 50 Ohm impedances. But household TV coax in the States (RG-59, RG-6, RG-11, and friends) is 75 Ohm. And impedance matte

Wifi radios are generally designed for 50 Ohm impedances. But household TV coax in the States (RG-59, RG-6, RG-11, and friends) is 75 Ohm. And impedance matters. How much it matters varies by application, but it can be very important. There's more going on in bit of coax than a shielded conductor[1]. (Relatedly, twisted pair cabling like Cat5e has more going on than a few pairs of wires that happen to be twisted.) But the concept of having a pair of radios connected together with coax does, of course, work fine as long as the I's are crossed and the T's are dotted. I've set up PtP Wifi-ish wireless links on the bench with attenuators and coax jumpers instead of antennas, but I kept the characteristic impedance consistent throughout. (Many-to-many networks are also possible, with similar caveats.) [1]: Similarities of Wave Behavior, as presented by Dr. J.N. Shive, 1959. https://www.youtube.com/watch?v=DovunOxlY1k https://www.youtube.com/watch?v=DovunOxlY1k