John, my layout is 10'9" x 20'4" and I don't have a problem with the LionChief app when I use it. If I go about 10 or 20 feet outside of my train room I lose contact with the locomotive. If I use the Universal Remote the range is better. I don't think the app has very good range so I don't think you are doing anything wrong, but this is just based on my experience.
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