Look up some of the toroids you can wrap the wires around. Right before the signal goes into the servo would be best. Toroids should get the freqs off the wire that going into the servos. One of the other common cures like for cat5 and cat6 cable is twisted pairs of wire so twisting the wire might help get the hash off your wire thats being fed to the servos. If it is the freq jumping onto your wire it's just on the skin of the wire so the toroids absorb it. If its the video doing intermod with your controller circuits shielding is your best bet.

Keeping antenna seperated as far apart as can be arranged is good. Try to remember if the two have a common ground like through the battery connections its a path the trash can take and screw with your servo. Going seperate battery for video could be another relief. I imagine these little gizmos aren't too clean with their signals.

Good luck and all.

I'm just starting out in this game so hopefully I wont run into too many problems. I'm going to use ham bands since I'm a ham operator but I'm sure their will be some problems I'll run into. I primarily work HF and the VHF/UHF freqs are weak stuff especially at low power.