Besides, a Mirror will absolutely NOT "extend" IR. It might make it easier to bounce a signal around (as will a clean wall) but it won't make it travel any further than it would on its own in a straight line.

If you have to take the signal far, you have to re-encode it and transmit it with something that's not as lossy as light through the atmostphere. Whether this be with a more powerful RF transmitter/receiver system or through a wire. Then it can be decoded and blasted bakc out as IR on the other end.

B