Interesting. I love this forum.
I am impressed that your tests showed about a mile and a half increase in range over straight walkie-to-walkie.
I know one can’t really compare a $30 temporary cable to a $1200 repeater because the repeater includes two DTR radios plus all the circuitry, but I am sorely tempted to try this. I usually have a couple of radios not used and my only application would be temporary use anyway.
I would LOVE further reviews of this solution!