I use Bluetooth with Lego Mindstorms NXT most of the time, but when I need to connect to it when it is in the living room 20 feet away and around corners/through walls, it doesn't work! So, I used this I'ble: https://www.instructables.com/id/Increase-and-extend-the-range-of-a-USB-Bluetooth-d/ to add an external antenna to my Bluetooth dongle, and made a reflector out of a tin can (with a Dremel!). I'm not sure how much this helps, but it definitely does.
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