Anyone using this or know what the real range is? http://abtwireless.com/sunset.html They say 100 to 500 ft... but over what kind of terrain? Signal losses or blocked by house or trees? So, on the property where I might want to use this, most of the TFs are around the perimeter of maybe 1.5 acres... slightly curved on one side pie shaped lot with the house in the middle... I'm wondering how many might I need to synch 8 transformers... across the front of the lot is probably 160 ft. Depth on one side is at least 300 ft. BTW, If it's "not a photocell" then how does it work? And do all the ABT products work together?