Have several sites I fly at. Each site get ADJUST ANTENNA and/or WEAK SIGNAL message & at different distances.
After flying at a park in the mountains, I received ADJUST ANTENNA message at 1200 foot distance. I brought the Mavic Pro back via RETURN TO HOME. After landing full of frustration, I just sat there looking around at the beautiful scenery & noticed 3 cell phone towers spaced about 100 feet apart. I tried another park about a mile away & the distance flown before getting that same message was over a mile. One last note...the cell phone towers are shaped like trees about 100 feet tall & have vertical bars (boosts cell signal) encircling the top. Hope this helps