I will have to stop reading this forum. Yesterday I read about the Xiaomi WiFi repeater which I had never heard of before and an hour ago Amazon arrived with one.
Now I have just read about the Tile which again I had never heard of before and now Amazon is bringing one to me tomorrow
Edit: Useful tip for anyone getting a Tile - I also ordered some 3M Dual Lock to attach it to the
Tello. I found out about this stuff when I got a bright strobe light for my Mavic Pro. It is amazing and does the job that Velcro does but much, much better. Instead of hooks and loops it has little mushrooms that interlock. It is also backed with top quality contact adhesive. It is not cheap but you only need a small piece eg you would not need a piece anywhere near as big as the Tile to attach one.
Edit 2: I forgot to say thanks to MagooYFZ for telling us about the Tile

. There are various models including a longer range one but Mr Magoo has the best one as in his photo. It is called the Mate and is easily the lightest at 6.1g