Next Generation Home products recently released the
Remote Extender (LRRX) for the 418 MHz Frequency. I would like to clear up that this particular extender is only needed if you already has the 433MHz version and you are control to devices of the exact same model in one building. In other words, if device A's remote can control device B then you will need to separate extenders on different frequencies.
It should be noted that the LRRX 418 MHz has trouble with some Harmony remotes, whereas the LRRX 433MHz works on all harmony remotes except the new one that is rechargeable. Some may also choose the 418 MHz version because they have other wireless devices in the house that are interering with the LRRX