Hey I took mine out for my longest flight today as well, not near as impressive a distance as yours but it was almost 2x as far from home as I had ventured yet. I came back in and ordered one of those reflectors for the antennas off ebay, i lost contact most of the time after I was out toward the end as you can see from the Healthydrones signal map, it was a bit nerve racking but I was using the IOS version of Litchi so I was pretty sure it would just keep going on the plan if I lost signal. Only real bummer was I got back and realized I forgot to put the SD card in so no video ugh, the DJI app I think gave a bit more warning about that, the Litchi I guess does not...
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HealthyDrones.com - Innovative flight data analysis that matters