Bob, >In any event the , co plainer loop which is designed to cancel either sky >wave or ground wave over the HF bands is interesting. I need to re read and >understand what they are trying to do. Yah, let us know what you find out! Bill _________________________________________________________________ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963