basic RF transission in noisy environment
Reduce Common Mode emissions by CM filter choke using either Ferrite torroid around each motor wire pair or all wire pairs or wired dual coil CM choke or ferrite clamp on ribbon wire etc with similar CM choke on radio signals to uC using twisted pair or coax and Ferrite CM clamp.
Differential chokes are useful with decoupling caps to isolate conducted motor noise interfering with radio but emission noises are also important to suppress with small RF caps (pF) across motors with CM chokes and twisted pair. 

Ferrite beads for motor signals are often needed. http://www.digikey.com/products/en/filters/ferrite-beads-and-chips/841?k=ferrite&amp;k=&amp;pkeyword=ferrite&amp;pv7=3&amp;FV=fff40034%2Cfff802ab&amp;mnonly=0&amp;newproducts=0&amp;ColumnSort=0&amp;page=1&amp;quantity=0&amp;ptm=0&amp;fid=0&amp;pageSize=25


  Look at a professional design for ideas.


Consider you will need power common mode, CM chokes and differential mode (DM) chokes (ferrite beads) for motors, data signals, twisted pair and shielded twisted pair as well as RF shunt caps on data inputs.

BTW these are not very powerful radios suited for long range copters.