I built the diversity controller from here:
HTTP://github.com/sheaivey/rx5808-pro-diversity
I noticed that I could fit most of the components into the module bay of the fatshark Dominators and have a portable scanner right on my goggles.
I located the arduino pro mini in the head tracker bay, and wired the CH buttons and the press down for the contrast/brightness to the arduino.
If you like Sheaivey's work please donate to his project
Check out my build log here: http://www.rcgroups.com/forums/showthread.php?t=2629411#post34317133