Garry, NI6T wrote: "EZNEC 4, and it, like EZNEC 3, uses the NEC-2 engine. EZNEC 4+ offers more segments and a few additional features, but also utilizes NEC-2." ========== My mistake. Dean, N6BV said that he was using the NEC-4 engine, so it must've been EZNEC Pro. 73, de Earl, K6SE