I just tested this. I did the test with and without the Mi extender. Control range was the same for each test which surprised me: about 121-meters. I could have gone further but I ran out of room. However, there was a lot more breakup and the usual dropped frames without the repeater. With the repeater, I didn't get any dropouts or choppy video until out about 110-meters. I'm putting together a full video on it soon.