This is just wireless adapter (WIFI NIC), no extender function. Could be good if you will be able to use it instead of integrated Wifi Adapter in your Phone/Tablet (Android only), but TELLO is "just" 2,4 GHz anyway.
I am just waiting for the packages to do full test and figre out why the hell any extender do its job with TELLO.
Honestly - all Repeaters and Extenders are depended on stable wifi source, which is TELLO.
I cant explain my self why it works, because TELLO is just flying!
Generaly for best experience, it should be in the middle of distance between you and TELLO or next to (flying with) the TELLO (closest to the source - Access Point).
Sometimes I dont like my natural curiousity - so time consuming and same result