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I’ve had good results with a Talkinghouse sitting on a concrete pad! The bigger issue is getting the antenna away from any other objects, especially that wall. The short antennas like on the Talking House work best in open areas, the ideal would be the concrete pad in the middle of the yard with nothing around it for a hundred feet, or mounted on a rooftop above other buildings and trees.
You might not be able to do that, but use the idea, get it into the open as much as possible, I’m almost sure the range will go up a lot!