All this talk about the original penetrator gets me going. I have to tell you guys, that my late 1970's Penetrator is still up and working like a champ. Only thing I did to it is put new top hat radials on it like 5 years ago. Its 45 feet up and works just as good as an Imax2000 thats 85 feet up in a pine tree. I can't remember the length off the top of my head but the perfect SWR is at 27.335mhz.