Mark,
I think I read somewhere that the synthesizer of the Weatronic is shared between the two receivers, ie they would both be on the exact same frequency (so much for redundancy []).
The ability to "bind" to the exact frequency won't help you if someone is on the "same" channel as it would probably only be a small amount the frequency is "off", and as soon as the "correct" transmitter is received with less signal strength, the "wrong" transmitter that is a little "off frequency" would be received with a strong signal, passing thru the filters in the reciver...
I might be wrong, but I think this is how it would work....