I took the insides out of the MI range extender, soldered SMS connectors on the antenna spots on the board ( there are two) soldered an old usb cable for power, put the whole mess in a plastic project, box, added an old 4Hawks antenna I had laying around and now I can easily go out over 1/2 mile before the signal starts to drop. I have plans to put two-2 watt boosters on the rig with the goal being a mile. I might add an external antenna to the Tello itself. Don’t say impossible because I regularly fly my Mavic 2 Zoom out 6 miles, which most people say is not possible. I do recommend the Marco Polo tracker (12 grams), which the Tello handles without a problem because I run with the prop guards removed.