> It locks down 2 x 2.4 frequencies per receiver at any point in time and shifting between them when needed, correct?

It's been a while since I worked on these for cell base stations, but it is probably a rake receiver. The idea is you take multiple antenna data and run it through a processing unit called an fpu (involving complex number signed math) and then combine the individual signal energies into a resultant signal with high signal to noise ratio.

Anyways, on the practical side, an old but interesting video from Spektrum on noise immunity:

https://www.youtube.com/watch?v=QaoXipp_288