The beauty of this DIY booster is no antenna mods required. You can install or remove the booster within seconds on Phantom 3 remote controller. It is cheap (cost almost nothing) and easier than any antenna mod without the hassles and risks of adding/replacing 2.4G antenna, pigtail cable and drilling holes on RC. It's widely used in RC hobby and Wi-Fi router for years.
Video shows how it works improving both RC and HD video signal
A modified PDF template for Phantom 3 antenna available for download
https://drive.google.com/file/d/0B6EvPgvmsFJlcVZ3QU5BZlFkVkk/view?usp=sharing
• Material required: card paper, aluminum foil (or aluminum/copper tape)
• Tools required: printer, scissors, utility knife, glue, double tape (I use double tape to stick aluminium foil onto card paper)
• DIY steps:
1. Print 2 copies of the PDF template on A4/Letter size paper (or direct on card paper if your printer support) from the above download link
2. Use common sense and follow the steps below
3.
https://rchelimenace.wordpress.com/how-to-build-your-own-windsurfer-antenna/
4.