Quadcopter Range Hack
The default control range of the Syma X5C drone is only 30 meter, adding a true 2.4ghz antenna you can double this range.
Find a 3db - 5db 2.4 Ghz WIFI Antenna
You can buy one, or remove from an old WIFI device.
Lucky for me, I found a bricked WIFI access point.
I removed the antenna from it.
Open the Syma Transmiiter
This is a very easy step, don't forget to unsolder the power wires.
Remove the original antenna (that 2cm wire).
Solder the new WIFI antenna in the Syma X5C transmitter.
Reasamble the Transmitter
After you checked everything, you can solder back the power wires and reassemble the transmitter.
The new transmitter looks good with the new antenna, and also has a better control range.
You can read more about this instractables here: Syma X5C Hack