How exactly is the multiple PI in multisync going to help? You still need to find a way to transmit the sync signal across the street and going this way will require a whole lot of equipment. Sure, if in the future the multiple houses go with RGB and thousands of channels then that would be the way to go but for a handful of LE's ...... There really are only two ways to deal with this. One is to raise the height of both the transmitter and the receivers on the other side of the street. The other is to add a second transmitter and put it on one of the properties directly across the street from the ones having issues and again, make sure that the transmitter is high enough so as not to be blocked by traffic. Just set the second transmitter and the 4 receivers across the street to a different channel.