Jackson
USA member at large
I found this to be quite interesting and with well explained guide. Covers a lot of ground with many tidbits about antennas, wavelengths, orientation, noise etc. I also like how he went into battery size and how the often recommended Turnigy 750mAh is not the best choice in this case.
http://cradylab.com/syma-x5-fpv-conversion/
http://cradylab.com/syma-x5-fpv-conversion/