Hi All,
What hasn't been mentioned is that this is in violation of FCC regs, therefore if you are flying with this gadget you are in violation of the AMA safety code, which invalidates your insurance coverage.
To make this legal he has to submit a prototype for FCC type acceptance.
Spred spectrum does not broadcast simultaneously on all channels, it uses a frequency hopping technique where it is broadcasting on only one frequency at a time, but rapidly hops from one frequency to another. This rapid hopping avoids interference with other users on the same cahnnel. This technology is being used in many military applications to avoid interception, it is also being used in cordless phones.
Look here for an explanation.
http://electronics.howstuffworks.com/question326.htm
Jerry