Our friend Richard Sisco has put together a video tutorial showing a do-it-yourself antenna modification process for the DJI Phantom 3 Standard drone. He uses 1 APA-M25 and 2 APA-M04 Wi-Fi antennas from Alfa to complete the modification.
See the tutorial video here.
See the range test video here (completed from 14,180 feet).
The first video has a link to the specific Alfa antennas sold by Rokland needed for the modification, as well as other parts you will need.
Update 6/15/17: We now have all three antennas used in the mod, plus all three pigtails needed, available in one special discounted package here.