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The signal coverage for my Talking House with ATU remote antenna is fairly solid for about .4 miles. Afer which, the AVC of the receiver begins to bring up the background noise.
I have “heard” my signal as far as 2 miles away although it’s not what the average listener would want to hear.
There are the occasional hot spots around town where out of the blue, the signal pops in very clear.
My coverage map is found HERE on my MRAM Webpage. Although not 100 percent correct given topographical variations, it’s reasonalbe.
The coax is about 35 feet. I did try coiling up some of the coax specifically to see if it would choke out signal flowing on the outside of the coax to ground. The coil was about 5 turns, 10 inches in diameter within 10 feet of the antenna. There was no appreciable difference noted.
The coax does not connect directly to the antenna. Rather, inside the ATU, there is a torroid transformer between the coax and the loading coil. I suppose it is for impedance matching and isolation.