A stock Bluetooth tracker tag, the kind you lose in a couch cushion, just hit 12 kilometers of range. Builder nktbuilds achieved this without touching the transmit power, using only a parabolic antenna and a low-noise receiver to pull a usable signal out of what most hardware would discard as noise floor garbage.
The method is not exotic but the result is. Two variables changed: antenna gain and receiver sensitivity. No amplifiers, no modified firmware, no additional power draw. The original tag runs stock. What makes the full video worth watching is how nktbuilds isolates each variable and shows the incremental range gains, which means you can lift the technique and apply it to other low-power protocols.
Bluetooth at 12 km is still not a LoRa replacement. LoRa has documented links at 830 miles line-of-sight and over 71,000 km with the right setup. What this does establish is that Bluetooth range is a receiver problem, not a transmitter problem, and that framing changes what you build next.
[READ ORIGINAL →]