Seems to be quite a bit of variation of Phantom 3 Standard (Stock) ranges. I just did 5433 Feet (1653 Meters) with my stock antenna. Had line of sight for the entire flight.
Phantom 3 Standard (Stock) - Distance Test
Bought a cheap Windsurfer on EBay and gave it a test run with my stock antenna. Made it out to 10,881 Feet (3,317 Meters) before RTH function kicked in. Had a bit of a scare though. Once I lost signal I assumed that I'd regain signal once the drone came back into range. This has happened in the past. Waited for minutes without any signal. I forced the RTH function after approx 5 minutes just in case the drone was hung or getting partial signal. I didn't get a signal until the drone was within visual range. Baring an unusual event, e.g. bird strike, loss of propeller, flying into a tall building, that RTH function is pretty sweet.
I uploaded my flight log to Healthy Drone and it appears I was having poor data connections starting from 5100 Feet on. Data connection was dropping anywhere from 1 second to 5.8 seconds along the way. Surprised I got as far as I did.
Flight light time Altitude Home Distance Type Notification
A 00m 00s 0.0 ft 0 ft Mode Mode changed to GPS_Atti
B 00m 02s -0.3 ft 0 ft Mode Mode changed to AutoTakeoff
C 00m 02s -0.3 ft 0 ft Tip Return-to-Home Altitude:196FT
D 00m 06s 7.2 ft 1 ft Mode Mode changed to GPS_Atti
E 00m 47s 111.5 ft 143 ft Tip Enter Course Lock Mode.__Exit F-Mode to exit Intelligent Flight Modes.
F 00m 47s 111.5 ft 143 ft Mode Mode changed to GPS_CL
G 03m 30s 174.9 ft 5,100 ft Data Loss Downlink data connection lost for 1.1 seconds
H 03m 40s 190.9 ft 5,462 ft Data Loss Downlink data connection lost for 1.4 seconds
I 03m 50s 190.9 ft 5,778 ft Data Loss Downlink data connection lost for 1 seconds
J 04m 35s 192.3 ft 7,249 ft Data Loss Downlink data connection lost for 1 seconds
K 04m 36s 192.3 ft 7,279 ft Data Loss Downlink data connection lost for 1 seconds
L 04m 43s 191.6 ft 7,530 ft Data Loss Downlink data connection lost for 5.8 seconds
M 05m 43s 192.3 ft 9,378 ft Data Loss Downlink data connection lost for 1.1 seconds
N 05m 49s 191.6 ft 9,543 ft Data Loss Downlink data connection lost for 1.5 seconds
O 06m 09s 191.9 ft 10,116 ft Data Loss Downlink data connection lost for 1 seconds
P 06m 23s 191.3 ft 10,510 ft Data Loss Downlink data connection lost for 2.1 seconds
Q 06m 33s 192.6 ft 10,803 ft Data Loss Downlink data connection lost for 2.6 seconds
R 06m 35s 196.8 ft 10,851 ft Data Loss Downlink data connection lost for 1.9 seconds
