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Here is a presentation from the 2004 Communications Academy.
You will need to supply the following username / password to access this file:
Username: comm Password: handout
Near Vertical NVIS Antenna Tri-band
PowerPoint presentation by Tom Sanders W6QJI and Ed Bruette N7NVP on Near Vertical Incident Skywave (NVIS) theory and construction details of a 75/60/40 meter tri-band antenna that can be erected in 20 to 30 minutes by one person. Well documented with photos of the process. Run the PowerPoint using the slide show feature and then view the individual slides and read the notes. 7.7MB file. Right click here to download.