I played around with it and to be honest, didn't see where it would fit into my situation.
Please correct me if I'm wrong, but the real value of Listen mode is to sit quietly for some amount of time until you're woken up by an external packet. In my case, the external weather unit never stops sending packets so sitting quietly for even a second isn't possible. The wind speed code constantly interrupts the processor and the rain unit interrrupts every time a rain reading of 0.01" is detected. With the radio constantly transmitting (minus the 8 second sleep I manage to slip in), would Listen mode work in this case?
The only way I got it to work reliably was to simply keep it awake up to 2 seconds after the last packet was transmitted. If no OTA request is received during that 2 seconds, it then sleeps for 8 seconds and starts the whole process over again.