Originally Posted By: LesSnyder
I don't know your age, but pre cable TV antennas were Yagi... with several distinct lengths of elements pre cut for a particular TV channel frequency (ABC,CBS,NBC)... and a smaller 8 or so element nose for the UHF/VHF networks... an antenna rotor was used to orient them


That's not exactly how a Yagi works, there's a really good article at http://en.m.wikipedia.org/wiki/Yagi-Uda_antenna .