I recently bought these Range Extenders from Amazon. I did a test run with the MM without the extenders here at my work and made it about 3700ft without them installed before I lost video signal and RTH. I then put the extenders on and made another run the same direction. At 5500ft I still had a great signal and perfect video feed. I turned around at that point because that is the farthest I've flown it, but it got me a solid 2000 extra feet in my location (rural). I'm sure I could have gotten more too. I did notice, though, that you really have to keep the antennas pointed at the drone though or signal can drop off quick. I actually started losing video feed after my 5500ft run by letting the drone fly past me and I didn't turn around to point the antenna at it and started loosing signal with it just 500ft away! LOL
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