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Most people use a smaller coax cable for jumpers in the shack and then run a heavier cable for the long run to the antenna. No different than joining two pieces with a barrel connector.
Its fine but just remember that mini 8 after a 50 foot lenght has a pretty significant lineloss. I have ran 100 foot runs and it still got the job done but some people are critical about the lineloss.
Coax question. I just put up a new Sirio monsoon base antenna with 100’ of rg8u coax testing with myMFJ antenna analyzer shows 1.4 swr at 26.965mhz and a 1.1 at 27.405 mhz . When I checked the ohms it’s steady a 30 ohms across the entire bandwidth.
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