I wanted to test my range with the 75ft BlueRail board and app. My basement is 60 ft wide. Although I would not run trains that far away as my layout is only 33 feet, I never lost connectivity. Then I took it outside and the results were quite interesting.
There are some other posts about bluetooth connectivity not working very well. But I can say the BlueRail connectivity does in fact work VERY well.
Have Fun!
Ron