I do believe it’s the comet 712efc. It seams to have super mistical powers that can not be explained by mortal man.
I have no idea from a technical stand point, however I have a base station (no repeater) with a 712efc and now I can transmit further with all my HTs in the property. I don’t know? I’m sure some rf radio nerd can tell us why this is the case or tell us why we are wrong.