RF extender to Harmony 1000

Hi,

Can anyone name any good brand of RF or IR extender that works allright with Harmony 1000?
I have tried one extender so far and that was both IR and RF (433Mhz)compatible..but it did not work well at all, since it was very sensitive with where i place the receiver part....need to put it just right in front of BD- HD players A/V recivers etc..

Is there some good extenders that would not be so point sensitive?

Thanks