The largest I´ve seen was WA6ZZK, think it was 11 or 12 elements, was on front page of CQ some 35 years ago, good greef I´m getting old. There are probably some 10 or 11 el Yagi´s out there but don´t know where, would suspect that there are some big stuff in former USSR that not too many know about. 73 Jim SM2EKM