The spectrum radio is a new type of radio that does not operate on 72mhz like all the current offerings.
Up to this point the best "anti-glitch" weve had is PCM2048. PCM= Pulse Code Modulation. The number 2048 refers to its bit rate or resolution.
It uses Pulse Code Modulation to in a somewhat vain attempt at locking on to a specific signal. But it still suffers (often to drastic effects) if someone turns on a tx on the same channel.

The new spectrum radio is Spread Spectrum. Imagine a wonderful world where there are no frequency pins, no accidental "shoot-downs", no glitching, and unlimited planes in the air at one time......well thats where the spectrum comes in.
It "jumps" around on multiple frequencies in a pre-determined pattern. If your reciever doesnt know the pattern or recieves a pattern its not set for....it doesnt accept the signal.
Also since the system operates on 2.4ghz instead of 72mhz, there's no chance of it interfering with existing recievers or accepting interference from other transmitters....even other spectrum recievers.

You could go out to a field where 30 people are flying, and flip on the tx without worrying about shooting someone down. They've been using this technology in cordless home phones for years to filter out and eliminate eavesdropping neighbors.

The RC Car guys got this technology first. Ive been sending e-mail after e-mail to Spektrum for a while now begging for a Airplane version of the system. Apparently enough people bugged them about it, and they finally released it.

The FCC limits the output power of the 2.4ghz devices, so right now with the current limits (I think its around 300mw), it affects range on the radio because the output power isnt high enough to broadcast long ranges. Im sure as the radios become more popular, eventually through legislation and lobbying the output power will be raised to 5W......enough to go fly nitro planes on.

You can read more about it at Spektrum's website located here......
http://www.spektrumrc.com/